What Does "Mailbox locked" in the Delivery Logs Mean?

Applies to SmarterMail 8.x - 15.x

When reviewing the delivery logs for an installation of SmarterMail, you may see messages that say "Mailbox Locked."

This message appears if SmarterMail tries to deliver a message to a mailbox that is currently being accessed via POP. If this is the case, the messages that are waiting to be delivered to that mailbox will remain in the spool until such time that the POP session is completed. Once that happens, the messages will be delivered to the mailbox.


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I am seeing this message several thousand times per minute continuously for several days. All the same user. This has happened a few times in the past few years, and each time required a restart to unlock the mail box. Any way to (1) have the mailbox automatically unlock when there are no active connections accessing it? (2) have the delivery service back off and only try retry maybe once per minute rather than dozens of times per second?
josh levine (October 5, 2014 at 12:44 PM)
We are getting the same error for our one of the domain from last 4-5 users..
Delivery attempt to emailid@domain to folder 'Inbox' failed. Mailbox is locked.
What is the solution accepted restart the SM Service or Windows Machine.

Rishikesh Somshetti (September 4, 2015 at 1:23 AM)

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