POP3 mail client aborts email collection with the following error
message: '-ERR Lock Exists. Is another session active??.'
A single user will not be able to collect mail from CMail using a POP3 mail client while
other users collect mail without a problem. The POP3 mail client will report a '-ERR
Lock Exists. Is another session active??.' error message.
When a user logs in to collect POP3 mail, CMail creates a Lock file. This means
that the mailbox becomes read only until the user is finished collecting mail from the
server. Mailbox locking is done to stop the server placing more mail in the users inbox
while a collection is in progress and therefore prevent data conflicts and corruption. If
CMail is restarted in the middle of a POP3 collection, the connection from the client is
terminated abnormally or another user tries to collect from the same box while a
collection is active, the user will receive the Lock Exists error message.
The Lock file can be deleted to free the mailbox. This is done by opening Windows
Explorer, locating the locked users home directory usually located in the CMail\Spool\username
directory and removing any files with a .pop extension.
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