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Registration No. 333-68601

811-09137

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As Filed with the Securities and Exchange Commission on May 26, 2004

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SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-6

REGISTRATION UNDER THE SECURITIES ACT OF 1933 [ X ]

Pre-Effective Amendment No. ____ [ ]

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Post-Effective Amendment No._12___ [ X ]

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and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940 [ X ]

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Amendment No.__21__ [ X ]

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Sun Life of Canada (U.S.) Variable Account I

Registrant

Sun Life Assurance Company of Canada (U.S.)

Depositor

One Sun Life Executive Park

Wellesley Hills, Massachusetts 02481

Depositor's Address

1-800-700-6554

Depositor's Telephone Number

Edward M. Shea

Assistant Vice President and Senior Counsel

Sun Life Assurance Company of Canada (U.S.)

One Sun Life Executive Park

Wellesley Hills, Massachusetts 02481

Name and Address of Agent For Service

It is proposed that this filing will become effective (check appropriate box)

[ ] immediately upon filing pursuant to paragraph (b) of Rule 485.

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[ X ] on May 26, 2004 pursuant to paragraph (b) of Rule 485.

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[ ] 60 days after filing pursuant to paragraph (a)(1) of Rule 485.

[ ] on May 1, 2004 pursuant to paragraph (a)(1) of Rule 485.

[ ] This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

PART A

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This Amendment No. 12 to the Registration on Form N-6 (File Nos. 333-68601, 811-09137) is being filed pursuant to Rule 485(b) under the Securities Act of 1933, as amended, in order to add a supplement to the prospectus filed with Post-Effective Amendment No. 11 to the Registration Statement, which was filed on April 27, 2004. This Amendment does not otherwise delete, amend or supersede any prospectus, statement of additional information, exhibit or other information contained in Post-Effective Amendment No. 11 to the Registration Statement.

SUPPLEMENT DATED MAY 26, 2004

PROSPECTUS DATED APRIL 30, 2004

FOR

FUTURITY VARIABLE UNIVERSAL LIFE INSURANCE

ISSUED BY SUN LIFE ASSURANCE COMPANY OF CANADA (U.S.)

SUN LIFE OF CANADA (U.S.) VARIABLE ACCOUNT I

I. The Board of Trustees of Sun Capital Advisers Trust has voted to terminate and liquidate the following funds, effective August 6, 2004: SC^SM Alger Growth Fund, SC^SM Alger Income & Growth Fund, SC^SM Alger Small Capitalization Fund, SC^SM Value Equity Fund, SC^SM Value Managed Fund, SC^SM Value Mid Cap Fund, SC^SM Investors Foundation Fund and SC^SM Select Equity Fund. Effective immediately, you may transfer your investment in the above funds to any other investment options available under your Policy. Any such transfer will not count against the number of free transfers permitted in one Policy Year. On the date of liquidation, if you still have an investment in the above funds, your investment will be transferred to the Sun Capital Money Market Fund.

II. On August 6, 2004, the Funds section is supplemented by the addition of the following investment options:

Dreyfus Investment Portfolios (advised by The Dreyfus Corporation)

Dreyfus MidCap Stock Portfolio seeks investment results that are greater than the total return performance of publicly traded common stocks of medium-size domestic companies in the aggregate, as represented by the S&P MidCap 400^(R) Index.

Goldman Sachs Variable Insurance Trust (advised by Goldman Sachs Asset Management, L.P.)

Goldman Sachs VIT Mid Cap Value Fund seeks long-term capital appreciation. Under normal circumstances, the Fund invests at least 80% of its net assets plus any borrowings for investment purposes (measured at time of purchase) in a diversified portfolio of equity investments in mid-cap issuers with public stock market capitalizations within the range of the market capitalization of companies constituting the Russell Midcap Value Index^(R) at the time of investment. If the market capitalization of a company held by the Fund moves outside this range, the Fund may, but is not required to, sell the securities.

MFS/Sun Life Series Trust (advised by Massachusetts Financial Services Company ("MFS"), a subsidiary of Sun Life of Canada (U.S.) Financial Services Holdings, Inc., which in turn is an indirect wholly owned subsidiary of Sun Life Financial, Inc., a diversified financial services organization)

MFS/Sun Life Value Series seeks capital appreciation and reasonable income by investing primarily in income producing equity securities of companies that MFS believes are undervalued in the market relative to their long term potential.

PIMCO Variable Insurance Trust (advised by Pacific Investment Management Company LLC ("PIMCO"))

PIMCO Low Duration Portfolio seeks maximum total return, consistent with preservation of capital and prudent investment management. The Portfolio seeks to achieve its investment objective by investing under normal circumstances at least 65% of its net assets in a diversified portfolio of Fixed Income Instruments of varying maturities. The average portfolio duration of the Portfolio normally varies within a one to three year time frame based on PIMCO's forecast for interest rates.

III. The Total Annual Fund Operating Expenses Table is replaced by the following:

TOTAL ANNUAL FUND OPERATING EXPENSES

Minimum

Maximum

Total Annual Fund expenses (expenses that are deducted from Fund assets, including management fees, distribution and /or service (12b-1) fees, and other expenses)

0.61%

2.60%

IV. On August 6, 2004, the following funds will be closed to new premium and transfers: AIM VI Core Equity Fund, AIM VI Growth Fund, MFS/Sun Life Capital Appreciation Series and MFS/Sun Life Emerging Growth Series. If you attempt to invest in the above funds on or after the liquidation date, your payment and/or transfer will be directed to the Sun Capital Money Market Fund.

V. On August 6, 2004, the asset allocation vendor changes from Sun Capital Advisers to Ibbotson Associates, Inc.

THIS SUPPLEMENT SHOULD BE READ AND RETAINED FOR FUTURE REFERENCE.

SUPPLEMENT DATED MAY 26, 2004

PROSPECTUS DATED APRIL 30, 2004

FOR

FUTURITY PROTECTOR VARIABLE UNIVERSAL LIFE INSURANCE

ISSUED BY SUN LIFE ASSURANCE COMPANY OF CANADA (U.S.)

SUN LIFE OF CANADA (U.S.) VARIABLE ACCOUNT I

I. The Board of Trustees of Sun Capital Advisers Trust has voted to terminate and liquidate the following funds, effective August 6, 2004: SC^SM Alger Growth Fund, SC^SM Alger Income & Growth Fund, SC^SM Alger Small Capitalization Fund, SC^SM Davis Financial Fund, SC^SM Neuberger Berman Mid Cap Growth Fund, SC^SM Neuberger Berman Mid Cap Value Fund, SC^SM Value Equity Fund, SC^SM Value Managed Fund, SC^SM Value Mid Cap Fund, SC^SM Investors Foundation Fund and SC^SM Select Equity Fund. Effective immediately, you may transfer your investment in the above funds to any other investment options available under your Policy. Any such transfer will not count against the number of free transfers permitted in one Policy Year. On the date of liquidation, if you still have an investment in the above funds, your investment will be transferred to the Fidelity VIP Money Market Portfolio.

II. On August 6, 2004, the Funds section is supplemented by the addition of the following investment options:

The Alger American Fund (advised by Fred Alger Management, Inc.)

Alger American MidCap Growth Portfolio seeks long-term capital appreciation by investing primarily in equity securities, such as common or preferred stocks, which are listed on U.S. exchanges or in the over-the-counter market. The portfolio focuses on mid-sized companies with promising growth potential.

Delaware Variable Insurance Products Trust (advised by Delaware Management Company)

Delaware VIP Growth Opportunities Series seeks long-term capital appreciation by investing primarily in common stocks of medium-sized companies.

Dreyfus Investment Portfolios (advised by The Dreyfus Corporation)

Goldman Sachs Variable Insurance Trust (advised by Goldman Sachs Asset Management, L.P.)

Lord Abbett Series Fund, Inc. (advised by Lord, Abbett & Co. LLC)

Lord Abbett Series Fund - Growth and Income Portfolio seeks to provide long-term growth of capital and income without excessive fluctuations in market value.

Lord Abbett Series Fund - Mid-Cap Value Portfolio seeks capital appreciation through investments, primarily in equity securities, which are believed to be undervalued in the marketplace.

Oppenheimer Variable Account Funds (advised by Oppenheimer Funds, Inc.)

Oppenheimer Capital Appreciation Fund/VA seeks capital appreciation by investing in securities of well-known, established companies.

PIMCO Variable Insurance Trust (advised by Pacific Investment Management Company LLC ("PIMCO"))

Scudder Variable Series II (advised by Deutsche Asset Management, Inc.)

SVS Dreman Small Cap Value Portfolio seeks long-term capital appreciation by investing at least 80% of net assets, plus the amount of any borrowings for investment purposes, in undervalued common stocks of small US companies, which the portfolio defines as companies that are similar in market value to those in the Russell 2000 Value Index.

T. Rowe Price Equity Series, Inc. (advised by T. Rowe Price Associates, Inc.)

T. Rowe Price Blue Chip Growth Portfolio seeks long-term capital growth by investing in high-quality U.S. growth companies.

Van Kampen Life Insurance Trust (advised by Van Kampen Asset Management Inc.)

Van Kampen LIT Growth and Income Portfolio seeks long-term growth of capital and income by investing primarily in income-producing equity securities, including common stocks and convertible securities; although investments are also made in non-convertible preferred stocks and debt securities.

III. On August 6, 2004, the following funds will be closed to new premium and transfers: AIM VI Core Equity Fund, AIM VI Growth Fund, AIM VI Premier Equity Fund, AllianceBernstein VP Technology Portfolio, INVESCO VIF Dynamics Fund, INVESCO VIF Small Company Growth Fund, MFS/Sun Life Capital Appreciation Series and MFS/Sun Life Emerging Growth Series. If you attempt to invest in the above funds on or after the liquidation date, your payment and/or transfer will be directed to the Fidelity VIP Money Market Portfolio.

IV. On August 6, 2004, the asset allocation vendor changes from Sun Capital Advisers to Ibbotson Associates, Inc.

THIS SUPPLEMENT SHOULD BE READ AND RETAINED FOR FUTURE REFERENCE.

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PART C

ITEM 26. EXHIBITS

A. Resolution of the Board of Directors of Sun Life Assurance Company of Canada (U.S.), dated October 29, 1998, authorizing the establishment of Sun Life of Canada (U.S.) Variable Account I (Incorporated herein by reference to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on December 9, 1998.)

Record of Action, dated December 1, 1998, authorizing the establishment of Sun Life of Canada (U.S.) Variable Account I (Incorporated herein by reference to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on December 9, 1998.)

Record of Action, dated March 30, 1999, relating to the establishment of Sun Life of Canada (U.S.) Variable Account I (Incorporated herein by reference to Pre-Effective Amendment No. 1 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on April 27, 1999.)

B. Form of Marketing Coordination Agreement between Sun Life Assurance Company of Canada (U.S.) and Clarendon Insurance Agency, Inc. (Incorporated herein by reference to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-59662, filed with the Securities and Exchange Commission on April 26, 2002.)

C. Principal Underwriting Agreement (Incorporated herein by reference to Post-Effective Amendment No. 2 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-94359, filed with the Securities and Exchange Commission on March 31, 2000.)

D. (1) Form of Flexible Premium Combination Fixed and Variable Life Insurance Policy (Incorporated herein by reference to Post-Effective Amendment No. 5 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on February 26, 2001.)

(2) Form of Accelerated Death Benefit Rider (Incorporated herein by reference to Pre-Effective Amendment No. 1 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on April 27, 1999.)

(3) Form of Accidental Death Benefit Rider (Incorporated herein by reference to Pre-Effective Amendment No. 1 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on April 27, 1999.)

(4) Form of Payment of Stipulated Premium Rider (Incorporated herein by reference to Pre-Effective Amendment No. 1 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on April 27, 1999.)

(5) Form of Waiver of Cost of Insurance Rider (Incorporated herein by reference to Post-Effective Amendment No. 4 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on February 12, 2001.)

(6) Form of Supplemental Insurance Rider (Incorporated herein by reference to Post-Effective Amendment No. 4 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on February 12, 2001.)

E. Form of Application for Flexible Premium Combination Fixed and Variable Life Insurance Policy (Incorporated herein by reference to Post-Effective Amendment No. 5 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on February 26, 2001.)

F. (1) Certificate of Incorporation of Sun Life Assurance Company of Canada (U.S.) (Incorporated herein by reference to the Registration Statement of Sun Life of Canada (U.S.) Variable Account F on Form N-4, File No. 333-37907, filed with the Securities and Exchange Commission on October 14, 1997.)

(2) Bylaws of Sun Life Assurance Company of Canada (U.S.) (Incorporated herein by reference to the Registration Statement of Sun Life of Canada (U.S.) Variable Account F on Form N-4, File No. 333-37907, filed with the Securities and Exchange Commission on October 14, 1997.)

G. Form of Reinsurance Contract. (Incorporated herein by reference to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form N-6, File No. 333-100829, filed with the Securities and Exchange Commission on October 30, 2002.)

H. (1)(a) Participation Agreement by and among AIM Variable Insurance Funds, Inc., AIM Distributors, Inc., Sun Life Assurance Company of Canada (U.S.), and Clarendon Insurance Agency, Inc. (Incorporated herein by reference to Post-Effective Amendment No. 5 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account G on Form S-6, File No. 333-13087, filed with the Securities and Exchange Commission on April 29, 1999.)

(1)(b) Amendment No. 1 to Participation Agreement by and among AIM Variable Insurance Funds, Inc., AIM Distributors, Inc., Sun Life Assurance Company of Canada (U.S.), and Clarendon Insurance Agency, Inc. (Incorporated herein by reference to Post-Effective Amendment No. 5 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account G on Form S-6, File No. 333-13087, filed with the Securities and Exchange Commission on April 29, 1999.)

(1)(c) Amendment No. 2 to Participation Agreement by and among AIM Variable Insurance Funds, Inc., AIM Distributors, Inc., Sun Life Assurance Company of Canada (U.S.), and Clarendon Insurance Agency, Inc. (Incorporated herein by reference to Post-Effective Amendment No. 5 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account G on Form S-6, File No. 333-13087, filed with the Securities and Exchange Commission on April 29, 1999.)

(1)(d) Amendment No. 6 to Participation Agreement by and among AIM Variable Insurance Funds, Inc., AIM Distributors, Inc., Sun Life Assurance Company of Canada (U.S.), and Clarendon Insurance Agency, Inc. (Incorporated herein by reference to Post-Effective Amendment No. 3 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-94359, filed with the Securities and Exchange Commission on April 26, 2002.)

(1)(e) Amendment No. 8 to Participation Agreement by and among AIM Variable Insurance Funds, Inc., AIM Distributors, Inc., Sun Life Assurance Company of Canada (U.S.), and Clarendon Insurance Agency, Inc. (Incorporated herein by reference to Post-Effective Amendment No. 4 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account G on Form N-6, File No. 333-65048, filed with the Securities and Exchange Commission on October 1, 2002.)

(2)(a) Participation Agreement by and among Sun Capital Advisers Trust, Sun Capital Advisers, Inc. and Sun Life Assurance Company of Canada (U.S.) (Incorporated herein by reference to Post-Effective Amendment No. 5 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account G on Form S-6, File No. 333-13087, filed with the Securities and Exchange Commission on April 29, 1999.)

(2)(b) Amendment No. 1 to Participation Agreement by and among Sun Capital Advisers Trust, Sun Capital Advisers, Inc., and Sun Life Assurance Company of Canada (U.S.) (Incorporated herein by reference to Post-Effective Amendment No. 5 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account G on Form S-6, File No. 333-13087, filed with the Securities and Exchange Commission on April 29, 1999.)

(2)(c) Amendment No. 2 to Participation Agreement by and among Sun Life Assurance Company of Canada (U.S.), Sun Capital Advisers Trust, and Sun Capital Advisers, Inc. (Incorporated herein by reference to Post-Effective Amendment No. 3 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-94359, filed with the Securities and Exchange Commission on April 26, 2002.)

(3)(a) Participation Agreement by and among Sun Life Assurance Company of Canada (U.S.), Variable Insurance Products Fund and Fidelity Distributors Corporation (Incorporated herein by reference to Post-Effective Amendment No. 3 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-94359, filed with the Securities and Exchange Commission on April 26, 2002.)

(3)(b) Amendment No. 1 to Participation Agreement by and among Sun Life Assurance Company of Canada (U.S.), Variable Insurance Products Fund and Fidelity Distributors Corporation (Incorporated herein by reference to Post-Effective Amendment No. 3 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-94359, filed with the Securities and Exchange Commission on April 26, 2002.)

(3)(c) Amendment No. 2 to Participation Agreement by and among Sun Life Assurance Company of Canada (U.S.), Variable Insurance Products Fund and Fidelity Distributors Corporation (Incorporated herein by reference to Post-Effective Amendment No. 3 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-94359, filed with the Securities and Exchange Commission on April 26, 2002.)

(3)(d) Amendment No. 4 to Participation Agreement by and among Sun Life Assurance Company of Canada (U.S.), Variable Insurance Products Fund and Fidelity Distributors Corporation. (Incorporated herein by reference to Post-Effective Amendment No. 4 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account G on Form N-6, File No. 333-65048, filed with the Securities and Exchange Commission on October 1, 2002.)

(4)(a) Participation Agreement by and among Sun Life Assurance Company of Canada (U.S.), Clarendon Insurance Agency, Inc., Alliance Capital Management L.P. and Alliance Fund Distributors, Inc. (Incorporated herein by reference to Post-Effective Amendment No. 3 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-94359, filed with the Securities and Exchange Commission on April 26, 2002.)

(4)(b) Amendment No. 3 to Participation Agreement by and among Sun Life Assurance Company of Canada (U.S.), Alliance Capital Management L.P. and Alliance Fund Distributors, Inc. (Incorporated herein by reference to Post-Effective Amendment No. 4 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account G on Form N-6, File No. 333-65048, filed with the Securities and Exchange Commission on October 1, 2002.)

(5) Participation Agreement, dated as of May 1, 2000, by and among the Franklin Templeton Variable Insurance Products Trust, Franklin Templeton Distributors, Inc, and Sun Life Assurance Company of Canada (U.S.) (Incorporated herein by reference to Post-Effective Amendment No. 7 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account G on Form S-6, File No. 333-13087, filed with the Securities and Exchange Commission on April 30, 2001.)

(6)(a) Participation Agreement by and among Goldman Sachs Variable Insurance Trust, Goldman, Sachs & Co., and Sun Life Assurance Company of Canada (U.S.) (Incorporated herein by reference to Pre-Effective Amendment No. 1 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on December 9, 1998.)

(6)(b) Amendment No. 5 to Participation Agreement by and among Goldman Sachs Variable Insurance Trust, Goldman, Sachs & Co., and Sun Life Assurance Company of Canada (U.S.) (Incorporated herein by reference to Post-Effective Amendment No. 3 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-94359, filed with the Securities and Exchange Commission on April 26, 2002.)

(6)(c) Amendment No. 7 to Participation Agreement by and among Goldman Sachs Variable Insurance Trust, Goldman, Sachs & Co., and Sun Life Assurance Company of Canada (U.S.). (Incorporated herein by reference to Post-Effective Amendment No. 4 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account G on Form N-6, File No. 333-65048, filed with the Securities and Exchange Commission on October 1, 2002.)

(7)(a) Participation Agreement by and among Sun Life Assurance Company of Canada (U.S.), INVESCO Variable Investment Funds, Inc., INVESCO Funds Group, Inc. and INVESCO Distributors, Inc. (Incorporated herein by reference to Post-Effective Amendment No. 3 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-94359, filed with the Securities and Exchange Commission on April 26, 2002.)

(7)(b) Amendment No. 1 to Participation Agreement by and among Sun Life Assurance Company of Canada (U.S.), INVESCO Variable Investment Funds, Inc., INVESCO Funds Group, Inc. and INVESCO Distributors, Inc. (Incorporated herein by reference to Post-Effective Amendment No. 3 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-94359, filed with the Securities and Exchange Commission on April 26, 2002.)

(7)(c) Amendment No. 4 to Participation Agreement by and among Sun Life Assurance Company of Canada (U.S.), INVESCO Variable Investment Funds, Inc., INVESCO Funds Group, Inc. and INVESCO Distributors, Inc). (Incorporated herein by reference to Post-Effective Amendment No. 4 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account G on Form N-6, File No. 333-65048, filed with the Securities and Exchange Commission on October 1, 2002.)

(8)(a) Participation Agreement by and among MFS/Sun Life Series Trust, Sun Life Assurance Company of Canada (U.S.), and Massachusetts Financial Services Company (Incorporated herein by reference to Pre-Effective Amendment No. 1 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account G on Form S-6, File No. 333-13087, filed with the Securities and Exchange Commission on January 22, 1997.)

(8)(b) Amendment No. 4 to Participation Agreement by and among MFS/Sun Life Series Trust, Sun Life Assurance Company of Canada (U.S.), and Massachusetts Financial Services Company (Incorporated herein by reference to Post-Effective Amendment No. 3 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-94359, filed with the Securities and Exchange Commission on April 26, 2002.)

(9) Participation Agreement by and among Sun Life Assurance Company of Canada (U.S.), Deutsche Asset Management VIT Funds and Deutsche Asset Management, Inc. (Incorporated herein by reference to Post-Effective Amendment No. 2 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account G on Form S-6, File No. 333-65048, filed with the Securities and Exchange Commission on July 3, 2002.)

(10) Participation Agreement by and among Sun Life Assurance Company of Canada (U.S.), Sun Life Insurance and Annuity Company of New York, PIMCO Variable Insurance Trust and PIMCO Funds Distributors LLC. (Incorporated herein by reference to Post-Effective Amendment No. 3 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form N-6, File No. 333-59662, filed with the Securities and Exchange Commission on February 26, 2003.)

(11) Participation Agreement by and among Sun Life Assurance Company of Canada (U.S.), OCC Accumulation Trust and OCC Distributors. (Incorporated herein by reference to Pre-Effective Amendment No. 1 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on April 27, 1999.)

(12) Participation Agreement by and among Sun Life Assurance Company of Canada (U.S.), The Alger American Fund and Fred Alger and Company, Incorporated. (Incorporated herein by reference to Pre-Effective Amendment No. 1 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form S-6, File No. 333-68601, filed with the Securities and Exchange Commission on April 27, 1999.)

I. None.

J. (1) Powers of Attorney. (Incorporated herein by reference to the Registration Statement of Keyport Variable Account A on Form N-4, File No. 333-112506, filed with the Securities and Exchange Commission on February 5, 2004.)

(2) Resolution of the Board of Directors of the Depositor dated July 24, 2003, authorizing the use of Powers of Attorney for Officer signatures. (Incorporated herein by reference to the Registration Statement of Keyport Variable Account A on Form N-4, File No. 333-112506, filed with the Securities and Exchange Commission on February 5, 2004.)

K. Legal Opinion. (Incorporated herein by reference to Post-Effective Amendment No. 11 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form N-6, File No. 333-68601, filed with the Securities and Exchange Commission on April 27, 2004.)

L. None.

M. None.

N. Independent Auditor's Consent. (Incorporated herein by reference to Post-Effective Amendment No. 11 to the Registration Statement of Sun Life of Canada (U.S.) Variable Account I on Form N-6, File No. 333-68601, filed with the Securities and Exchange Commission on April 27, 2004.)

O. None.

P. None.

Q. None.

ITEM 27. DIRECTORS AND OFFICERS OF THE DEPOSITOR

Name and	Principal Positions and Officers
Business Address	With Depositor

Donald A. Stewart	Director
150 King Street West
Toronto, Ontario
Canada M5H 1J9

C. James Prieur	Chairman and Director
150 King Street West
Toronto, Ontario
Canada M5H 1J9

Robert C. Salipante	President and Director
One Sun Life Executive Park
Wellesley Hills, MA 02481

David D. Horn	Director
257 Lake Street
P.O. Box 24
New Vineyard, ME 04956

James A. McNulty, III	Director
12 Wild Holly Lane
Medfield, MA 02052

S. Caesar Raboy	Director
220 Boylston Street
Boston, MA 02110

William W. Stinson	Director
1001 13^th Avenue S.W.
Calgary, Alberta
Canada T2R 0L5

James C. Baillie	Director
Torys Suite 300, Maritime Life Tower
Toronto, Ontario
Canada MSK 1N2

Paul W. Derksen	Director
150 King Street West
Toronto, Ontario
Canada M5H 1J9

David K. Stevenson	Director
359 Grove Street
Needham, MA 02492

Claude A. Accum	Vice President and Chief Actuary
One Sun Life Executive Park
Wellesley Hills, MA 02481

James M.A. Anderson	Vice President, Investments
One Sun Life Executive Park
Wellesley Hills, MA 02481
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Gary Corsi	Vice President and Chief Financial Officer and Treasurer
One Sun Life Executive Park
Wellesley Hills, MA 02481

Mark W. DeTora	Vice President, Individual Insurance
One Sun Life Executive Park
Wellesley Hills, MA 02481

Ellen B. King	Assistant Vice President and Senior Counsel and
One Sun Life Executive Park	Secretary
Wellesley Hills, MA 02481

John R. Wright	Executive Vice President, Sun Life Financial U.S. Operations
One Sun Life Executive Park
Wellesley Hills, MA 02481

Janet V. Whitehouse	Vice President, Human Resources and
One Sun Life Executive Park	Public Relations
Wellesley Hills, MA 02481

ITEM 28. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH THE DEPOSITOR OR THE REGISTRANT

No person is directly or indirectly controlled by the Registrant. The Registrant is a separate account of Sun Life Assurance Company of Canada (U.S.), a wholly-owned subsidiary of Sun Life of Canada (U.S.) Holdings, Inc., a wholly-owned subsidiary of Sun Life Assurance Company of Canada - U.S. Operations Holdings, Inc., which is in turn a wholly-owned subsidiary of Sun Life Assurance Company of Canada.

The organization chart of Sun Life Assurance Company of Canada is filed as Exhibit 13 to the Registration Statement on Form N-4 of Keyport Variable Account A, File Nos. 333-114126, 811-07543, filed April 1, 2004.

None of the companies listed in such Exhibit 13 is a subsidiary of the Registrant; therefore, the only financial statements being filed are those of Sun Life Assurance Company of Canada (U.S.).

ITEM 29. INDEMNIFICATION

Pursuant to Section 145 of the Delaware Corporation Law, Article 8 of the By-laws of Sun Life Assurance Company of Canada (U.S.), as amended effective as of January 1, 2000 (a copy of which was filed as Exhibit 6(b) to Pre-Effective Amendment No. 1 to Registrant's Registration Statement on Form N-4, File No. 333-30844) provides for the indemnification of directors, officers and employees of Sun Life Assurance Company of Canada (U.S.). Insofar as indemnification for liability arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of Sun Life Assurance Company of Canada (U.S.) pursuant to the certificate of incorporation, by-laws, or otherwise, Sun Life (U.S.) has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by Sun Life (U.S.) of expenses incurred or paid by a director, officer, controlling person of Sun Life (U.S.) in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, Sun Life (U.S.) will submit to a court of appropriate jurisdiction the question whether such indemnification by them is against public policy as expressed in the Act, unless in the opinion of their counsel the matter has been settled by controlling precedent, and will be governed by the final adjudication of such issue.

ITEM 30. PRINCIPAL UNDERWRITERS

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Clarendon Insurance Agency, Inc., a wholly-owned subsidiary of Sun Life Assurance Company of Canada (U.S.), acts as general distributor for the Registrant, Sun Life of Canada (U.S.) Variable Accounts C, D, E, G, H and I, Keyport Variable Account A, KMA Variable Account, Keyport Variable Account I, KBL Variable Account A, KBL Variable Annuity Account, Sun Life (N.Y.) Variable Accounts A, B, C, and D and Money Market Variable Account, High Yield Variable Account, Capital Appreciation Variable Account, Government Securities Variable Account, World Governments Variable Account, Total Return Variable Account, and Managed Sectors Variable Account.

Name and Principal	Position and Offices
Business Address*	with Underwriter

Imants Sakson	President
James M.A. Anderson	Director
Gary Corsi	Director
Ellen B. King	Clerk
George E. Madden	Vice President & Chief Compliance Officer
Michael L. Gentile	Vice President
John E. Coleman	Vice President
Nancy C. Atherton	Assistant Vice President & Tax Officer
Jane F. Jette	Financial/Operations Principal and Treasurer

*The principal business address of all directors and officers of the principal underwriter is One Sun Life Executive Park, Wellesley Hills, Massachusetts 02481.

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ITEM 31. LOCATION OF ACCOUNTS AND RECORDS

Accounts, books and other documents required to be maintained by Section 31(a) of the Investment Company Act of 1940 and the Rules promulgated thereunder are maintained, in whole or in part, by Sun Life Assurance Company of Canada (U.S.) at its offices at One Sun Life Executive Park, Wellesley Hills, Massachusetts 02481 or at the offices of Clarendon Insurance Agency, Inc., at One Sun Life Executive Park, Wellesley Hills, Massachusetts 02481.

ITEM 32. MANAGEMENT SERVICES

Not applicable.

ITEM 33. FEE REPRESENTATION

Sun Life Assurance Company of Canada (U.S.)("Sun Life of Canada (U.S.)") hereby represents that the aggregate fees and charges under the Policy are reasonable in relation to the services rendered, the expenses expected to be incurred, and the risks assumed by Sun Life (U.S.).

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SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it meets all of the requirements of Securities Act Rule 485(b) for effectiveness of this Post-Effective Amendment to the Registration Statement and that it has duly caused this Post-Effective Amendment to be signed on its behalf by the undersigned thereunto duly authorized, and attested, all in the city of Wellesley Hills, and the Commonwealth of Massachusetts, on the 26th day of May, 2004.

SUN LIFE OF CANADA (U.S.) VARIABLE ACCOUNT I

(Registrant)

By: SUN LIFE ASSURANCE COMPANY OF CANADA (U.S.)

(Depositor)

By: */s/ Robert C. Salipante

Robert C. Salipante, President

Attest: /s/ Edward M. Shea

Edward M. Shea

Assistant Vice President and

Senior Counsel

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons and in the capacities and on the dates indicated.

*/s/ Robert C. Salipante Robert C. Salipante	President and Director (Principal Executive Officer)
*/s/ Gary Corsi Gary Corsi	Vice President and Chief Financial Officer (Principal Financial & Accounting Officer)
*/s/ Donald A. Stewart Donald A. Stewart	Director
*/s/ C. James Prieur C. James Prieur	Chairman and Director
*/s/ James C. Baillie James C. Baillie	Director
*/s/ David D. Horn David D. Horn	Director
*/s/ James A. McNulty, III James A. McNulty, III	Director
*/s/ David K. Stevenson David K. Stevenson	Director
*/s/ Paul W. Derksen Paul W. Derksen	Director
*/s/ S. Caesar Raboy S. Caesar Raboy	Director
*/s/ William W. Stinson William W. Stinson	Director
By: /s/ Edward M. Shea Edward M. Shea, Attorney-In-Fact		May 26, 2004

*By Edward M. Shea pursuant to Powers of Attorney (Incorporated by reference to Post-Effective Amendment No. 3 to the Registration Statement on Form N-4 (File 333-112506) filed on February 5, 2004).

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TOTAL ANNUAL FUND OPERATING EXPENSES	Minimum	Maximum
Total Annual Fund expenses (expenses that are deducted from Fund assets, including management fees, distribution and /or service (12b-1) fees, and other expenses)	0.61%	2.60%