[Dovecot] When imapc can't connect to remote IMAP prevents user login (and blocks LDA)

[Timo Sirainen]

On Sat, 2012-12-15 at 18:14 +0100, Marcin Mirosław wrote:
> I'm using dovecot 2.1.12-r1.
> When remote imap server rejects connections then I can't login into
> account and MTA can't deliver emails to maildir also.
> 
> I'm attaching snippets of logs:
> 2012-12-15T18:05:43.072594+01:00 meteor dovecot: imap-login: Login:
> user=<marcin at mejor.pl>, method=PLAIN,
> rip=2001:470:1f0b:1ab3:50af:bef4:6918:78ad, lip=2001:470:1f15:1b61::2,
> mpid=32533, TLS, session=<T0GGKOfQCQAgAQRwHwsas1CvvvRpGHit>
> 2012-12-15T18:05:43.442598+01:00 meteor dovecot: imap(marcin at mejor.pl)
> <T0GGKOfQCQAgAQRwHwsas1CvvvRpGHit>: Error: imapc(imap.wp.pl:143): Server
> disconnected: Connection reset by peer
> 2012-12-15T18:05:43.442598+01:00 meteor dovecot: imap(marcin at mejor.pl)
> <T0GGKOfQCQAgAQRwHwsas1CvvvRpGHit>: Error: imapc(imap.wp.pl:143):
> Authentication failed: Disconnected from server
> 2012-12-15T18:05:43.442598+01:00 meteor dovecot: imap(marcin at mejor.pl)
> <T0GGKOfQCQAgAQRwHwsas1CvvvRpGHit>: Error: imapc: Command failed:
> Disconnected from server
> 2012-12-15T18:05:43.442598+01:00 meteor dovecot: imap(marcin at mejor.pl)
> <T0GGKOfQCQAgAQRwHwsas1CvvvRpGHit>: Error: user marcin at mejor.pl:
> Initialization failed: Namespace 'xxx-wp-pl.': imapc: LIST failed:
> Internal error occurred. Refer to server log for more information.
> [2012-12-15 18:05:43]
> 2012-12-15T18:05:43.442598+01:00 meteor dovecot: imap(marcin at mejor.pl)
> <T0GGKOfQCQAgAQRwHwsas1CvvvRpGHit>: Error: Invalid user settings. Refer
> to server log for more information.

Would be nice to have fewer and nicer error message lines of course.

> I'd like to ask is this behavior correct?

You're using Dovecot as simple imapc proxy without local mails? Then
yeah, what else could it really do?