Intermittent mailbox not found

[Bron Gondwana]

On Mon, Mar 09, 2009 at 10:09:24PM -0400, Adam Tauno Williams wrote:
> On Tue, 2009-03-10 at 08:52 +1100, Bron Gondwana wrote:
> > On Mon, Mar 09, 2009 at 07:52:04PM +0000, Antony Gelberg wrote:
> > > Mar  9 14:29:07 captain cyrus/lmtpunix[20645]: verify_user(user.sirius-john)
> > > failed: Mailbox does not exits
> > Where on earth is that error message from?  I don't see "not exits"
> > anywhere in the current Cyrus codebase...
> 
> I'm thinking it is coming from Postfix's LMTP delivery agent.   I wonder
> if some other error, like a connect error, occurs and Postfix falls back
> to mailbox-does-not-exist.

This old thread might help you:

http://markmail.org/message/nqh3rrvhkt4ccs2r

Bron ( that's just the first one I found on google )