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

[Timo Sirainen]

On 19.12.2012, at 0.06, Marcin Mirosław <marcin at mejor.pl> wrote:

>>> 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?
> 
> Here is problem, I'm using local mails also!:) So when remote imap
> server doesn't want to talk with me I can't even check mail emails.
> I can understand this behavior (e.g. lda can't deliver email because
> sieve script could put such email in folder available via imapc) but it
> looks like a kind of DoS for my mailbox;) Maybe some kind of switch
> could be implemented: treat imapc errors as critical or not? Just an idea.

I saw only one namespace in your configuration. Are you adding the imapc namespace somewhere else, or how exactly does your system work? Anyway, if you have a separate imapc namespace, I think you can simply set:

namespace .. {
  ignore_on_failure = yes
}