Exhibit 23.6

                         INDEPENDENT AUDITORS' CONSENT

We consent to the incorporation by reference in this Registration Statement of
CMGI, Inc. on Form S-4/S-8 of our report dated October 18, 1999, accompanying
the consolidated financial statements of Flycast Communications Corporation and
subsidiary as of December 31, 1997 and 1998 and for each of the three years in
the period ended December 31, 1998, included in the Current Report on Form 8-K
of CMGI, Inc. dated December 17, 1999.

/s/ Deloitte & Touche LLP

San Jose, California
March 9, 2000