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imap on *hostname* status: failed

We noticed this appearing in one of the mailserver logs. Not often, perhaps once a week.

imap failed @ *TIMESTAMP*. A restart was attempted automagically.

Service Check Method: [socket connect]

Reason: TCP Transaction Log:
<< * OK [CAPABILITY IMAP4rev1 UIDPLUS CHILDREN NAMESPACE THREAD=ORDEREDSUBJECT THREAD=REFERENCES SORT QUOTA IDLE ACL ACL2=UNION STARTTLS] Courier-IMAP ready. Copyright 1998-2011 Double Precision, Inc. See COPYING for distribution information.
>> A001 LOGIN __cpanel__service__auth__imap__*********
<< * BYE Temporary problem, please try again later
imap: ** [* BYE Temporary problem, please try again later != A001 OK]
: Died at /usr/local/cpanel/Cpanel/TailWatch/ChkServd.pm line 689, <$socket_scc> line 2.

Number of Restart Attempts: 1

Startup Log: Starting Courier authentication services: authdaemond
ier-IMAP server: imap imap-ssl pop3 pop3-ssl

The fix was here:

https://support.crucialp.com/index.php?_m=knowledgebase&_a=viewarticle&k...

Go to Main >> Service Configuration >> Mailserver Configuration

Increasing "Number of Authentication Daemons" resolves this problem.

Until you have more users of course!