Mail.app Issues after migrating dovecot from High Sierra Server to Mojave + MacPorts (solved)

[Gerben Wierda]

Just reporting in case someone else runs into this.

I’ve just migrated from an old dovecot server to a new one based on MacPorts dovecot etc..

The mailboxes have been migrated with doveadm backup and sync. Receiving and sending mail in the INBOX worked. Moving a message to another mailbox at the top level worked as well. Just not when there is a mailbox hierarchy and I’m more than one level down.

When trying to move a message from INBOX to another mailbox with Apple Mail (macOS Mojave) I got the following error:

	The IMAP command “UID COPY”  failed for the mailbox “INBOX” with server error: Character not allowed in mailbox name: '.'

dovecot showed no errors in mail-error.log or mail-info.log

Creating a Mailbox TestLevelOne worked and .TestLevelOne was created in the Maildir store
Creating a Mailbox TestLevelOne/TestLevelTwo didn’t work
Accessing any mailbox at level 2 did not work (only showed old cache)

mail-debug.og didn’t show anything when I tried this.

The solution was that somehow Apple Mail.app (Mojave) had become corrupted. Removing its contents from ~/Library and recreating the accounts solved the issue.

Gerben Wierda
Chess and the Art of Enterprise Architecture <http://enterprisechess.com/>
Mastering ArchiMate <http://masteringarchimate.com/>
Architecture for Real Enterprises <https://www.infoworld.com/blog/architecture-for-real-enterprises/> at InfoWorld
On Slippery Ice <https://eapj.org/on-slippery-ice/> at EAPJ

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