Reading through some very old posts on the list it seems as though, although not very popular, it is possible to perform authentication in Postfix using GSSAPI. Setting up the keytab for the smtpd server seems straightforward enough, however, I'm unsure what to do when it comes to the smtp or lmtp client. I'm guessing that these services would require tickets to connect to another postfix instance or mail store like cyrus-imap, but there doesn't seem to be a way to obtain those tickets. Is something like a cron job for user postfix that obtains a ticket from an accessible keytab the best way to go or does Postfix have some other built-in means to kinit for the tickets?
Steve
