I've gotten several of these today from my dedicated server. Should I investigate more, or is there no reason for concern?

Code:
imap failed @ Sun Apr  4 23:17:41 2010. 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__9KzSjhNn7HO0INXnmBQCQH8LhWF1WG... jaXjwfqkxnVgCKGC
<<
imap: ** [ != A001 OK]