Report of Independent Registered Public Accounting Firm

To the Shareholders and Board of Trustees of MFS Series
Trust VI

In planning and performing our audit of the financial
statements of MFS Global Equity Fund, MFS Global Total
Return Fund and MFS Utilities Fund (the "Funds")
(three of the series constituting MFS Series Trust VI
(the "Trust")) as of and for the year ended October 31, 2023,
in accordance with the standards of the Public Company
Accounting Oversight Board (United States) (PCAOB), we
considered the Trust's internal control over financial
reporting, including controls over safeguarding securities,
as a basis for designing our auditing procedures for
the purpose of expressing our opinion on the financial
statements and to comply with the requirements of Form N-CEN,
but not for the purpose of expressing an opinion on the
effectiveness of the Trust's internal control over financial
reporting. Accordingly, we express no such opinion.

The management of the Trust is responsible for establishing and
maintaining effective internal control over financial reporting.
In fulfilling this responsibility, estimates and judgments by
management are required to assess the expected benefits and
related costs of controls. A company's internal control
over financial reporting is a process designed to provide
reasonable assurance regarding the reliability of financial
reporting and the preparation of financial statements for
external purposes in accordance with U.S. generally
accepted accounting principles. A company's internal control
over financial reporting includes those policies and procedures
that (1) pertain to the maintenance of records that, in reasonable
detail, accurately and fairly reflect the transactions and
dispositions of the assets of the company; (2) provide
reasonable assurance that transactions are recorded as
necessary to permit preparation of financial statements in
accordance with U.S. generally accepted accounting principles,
and that receipts and expenditures of the company are
being made only in accordance with authorizations of management
and directors of the company; and (3) provide reasonable assurance
regarding prevention or timely detection of unauthorized acquisition,
use or disposition of a company's assets that could have a material
effect on the financial statements.

Because of its inherent limitations, internal control over financial
reporting may not prevent or detect misstatements. Also, projections
of any evaluation of effectiveness to future periods are subject to
the risk that controls may become inadequate because of changes in
conditions, or that the degree of compliance with the policies or
procedures may deteriorate.

A deficiency in internal control over financial reporting exists when
the design or operation of a control does not allow management or
employees, in the normal course of performing their assigned
functions, to prevent or detect misstatements on a timely basis.
A material weakness is a deficiency, or a combination of
deficiencies, in internal control over financial reporting, such
that there is a reasonable possibility that a material misstatement
of the Trust's annual or interim financial statements will not be
prevented or detected on a timely basis.

Our consideration of the Trust's internal control over financial
reporting was for the limited purpose described in the first
paragraph and would not necessarily disclose all deficiencies
in internal control that might be material weaknesses under
standards established by the PCAOB. However, we noted no
deficiencies in the Trust's internal control over financial
reporting and its operation, including controls over safeguarding
securities, that we consider to be a material weakness as defined
above as of October 31, 2023.

This report is intended solely for the information and use of
management and the Board of Trustees of MFS Series Trust VI
and the Securities and Exchange  Commission and is not
intended to be and should not be used by anyone other than
these specified parties.

/s/Ernst & Young LLP
Boston, Massachusetts
December 14, 2023