Exhibit 23.1

                         Consent of Independent Auditors

We consent to the reference to our firm under the caption "Experts" in the
Registration Statement (Form S-3) and related Prospectus of Bottomline
Technologies (de), Inc. for the registration of 156,228 shares of its common
stock and to the incorporation by reference therein of our report dated August
3, 2001, except for Note 13 as to which the date is September 17, 2001, with
respect to the consolidated financial statements and schedule of Bottomline
Technologies (de), Inc. included in its Annual Report (Form 10-K) for the year
ended June 30, 2001, filed with the Securities and Exchange Commission.


                                                  /s/ ERNST & YOUNG LLP
                                                  ---------------------


Boston, Massachusetts
November 9, 2001