On Wed, 2011-06-15 at 14:40 +0200, Peter Eriksson wrote:

Hmm... I'm seeing a lot of:

...

• OK Waiting for authentication process to respond..
• OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE STARTTLS AUTH=PLAIN AUTH=LOGIN AUTH=GSSAPI AUTH=GSS-SPNEGO] Welcome to the IFM Dovecot Mail Server.

when IMAP clients connect to our server (ie that "Waiting for.." message before the login OK message).

Now, most clients seems to handle this extra information message just fine, but it still is annoying me. It doesn't appear all the time, but pretty often...

What can I adjust/fix in order to make it go away?

I'd guess it means two things:

1. Client doesn't actually care about the OK reply at all, and tries to send some command immediately after connecting.

2. You're using the "high-security mode" of login processes, which is why there is a small delay before login process gets a reply from auth. You could switch to either "high-performance mode" (http://wiki2.dovecot.org/LoginProcess) or probably just setting service imap-login { process_min_avail } to some small number also helps.