I would like to reiterate that the issue that was introduced in SmarterMail in Build 7426 will ONLY affect those servers that were running that build. It was not present in 7425 and earlier and was fixed in Build 7429.  Those servers that had run Build 7426 may encounter reports of "Message missing", especially in POP3 clients, the next time they connect.

It's important to note that no messages have gone missing from the server, it's just a false error message being reported to the client.

Specifically, what was happening was this:

If a mailbox had all of its messages deleted (which is common with POP3), the mailbox.cfg was not being properly updated that all messages had been deleted. The next time a client application would request the message list for that folder, the mailbox.cfg would say it had messages available, even though the folder had been cleared.

When the client would attempt to retrieve these messages, they would not exist (because they had been previously deleted) and a "Message missing" message would be shown in its place. No new messages were being deleted, it was just a false error report.

This "Message missing" will happen per user for each folder that had ALL messages deleted while running on Friday's build. Once Build 7429 is installed this behavior is corrected, but the users will get that message, once per folder. This affected POP3 users the most since those clients are typically configured to remove all messages from the server once they have been downloaded.