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I am in the process of moving a courier IMAP server from one machine to another. Maildirs have been set up, all the messages have been copied successfully. There are a few IMAP folders that show up in the mail clients on the old server, but they are not visible on the new destination server. I compared the client/server communication side by side in Wireshark and it turned out that the IMAP LIST command 

4 list "" "INBOX.*"

returns the list of IMAP folders on both machines. The IMAP LSUB command, however, on the destination machine returns an empty set while on the source machine it also returns a list of all Maildir folders.

5 lsub "" "INBOX.*"

Anyone has a clue, why the LSUB command does not return the subfolders on one machine, while on the other it does?

Note: The courierimapsubscribed file in the Maildir on both servers are exactly the same, both contain all folders.

Source: courier-imap 4.10 armhf; Destination: courier-imap 4.18 amd64

Aileron79
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1 Answers1

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Ok, I was able to resolve the issue bei creating and deleting a folder in the Maildir using the e-mail client (Thunderbird, in that case). Restarted the client and all folders showed up. Strange detail: the courierimapsubscribed file was completely the same, before and after.

Aileron79
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