On Mon, 2012-02-27 at 14:17 +1300, Mark Davies wrote: > Feb 27 13:42:18 bats dovecot: auth: > GSSAPI(mark at ECS.VUW.AC.NZ,130.195.5.88): Invalid base64 data in > continued response Looks like kmail is sending some kind of garbage to Dovecot. Set auth_debug_passwords=yes to make Dovecot log the auth traffic.