If you are on cpanel server you might encounter errors related to imap. Below given is an example of error you might encounter.
Imap error: Service Check Method: [tcp connect]
The /var/log/maillog will show the additional errors as well.
imap failed @ Sat Dec 20 00:18:56 2008. A restart was attempted automagically. Service Check Method: [tcp connect] Failure 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 1998-2008 Double Precision, Inc. See COPYING for distribution information. >> >> A001 LOGIN __cpanel__service__auth__imap__PNIT3F....NZI << * BYE Temporary problem, please try again later imap: ** [* BYE Temporary problem, please try again later != A001 OK] Cmd Service Check Raw Output:
The issue can be fixed by increasing the authentication daemons for courier in the server.
Follow the below given steps:
Login to WHM
Mail server configuration
Number of authentication Daemons (Increase the current value to higher)
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