On Tue, Jul 02, 2013 at 11:25:53AM -0400, Erinn Looney-Triggs wrote: > However, it still is not working. > > Running a debug_peer_list with the verbosity set to 2 against both a > thunderbird client working with GSSAPI and the postfix client. It > appears that GSSAPI is not even being tried by the postfix client. It > negotiates the TLS session, is presented with GSSAPI as an auth option, > and then it just attempts to send the message (MAIL FROM etc.). Whereas > the thunderbird client does the GSSAPI negotiation (AUTH GSSAPI etc.).
The destination needs to appear the smtp_sasl_password_maps database, even when you're not using a password-based mechanism. This tells Postfix to use SASL for the destination. [smtp.example.com]:587 gssapi:nopassword You naturally need to make sure that you've installed the GSSAPI plugin for SASL and that smtp_sasl_mechanism_filter is set correctly. -- Viktor.