Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos. 333-78471, 333-78467, 333-78469, 333-78473, 333-50418, 333-50202, 333-65044, 333-102060 and 333-111803) pertaining to the 1998 Employee Stock Purchase Plan, the Amended and Restated 1997 Stock Incentive Plan, the 1989 Stock Option Plan, the 1998 Director Stock Option Plan, the 1990 Incentive Stock Option Plan, the 1997 Incentive Stock Option Plan, the 2000 Stock Incentive Plan, and the 2000 Employee Stock Purchase Plan of Bottomline Technologies (de), Inc. and in the Registration Statements on Form S-3 (Nos. 333-43842, 333-50810, 333-62330, 333-73366, 333-102064 and 333-116196) of our report dated July 29, 2004 with respect to the consolidated financial statements and schedule of Bottomline Technologies (de), Inc. included in this Annual Report (Form 10-K/A Amendment No. 1) for the year ended June 30, 2004.
/s/ ERNST & YOUNG LLP
Boston, Massachusetts
September 21, 2004
