Instead of a folder list, a user is experiencing the following error in Squirrelmail:
[INDENT]ERROR: Could not complete request.
Query: CREATE “INBOX.Learn Spam”
Reason Given: Cannot create this folder.
The [Siteworx] user’s postmaster account plus a test account behave normally. Roundcube and IMP likewise work fine for the same user. All other domains are normal. Just this one mail account has the problem.
In shell I verified the user’s ownership and permissions are ok. And as stated, maildir folders and files are intact.
Years ago when I encountered a similar error in Squirrelmail it turned out to be a typo for the IMAP namespace in the config file but that’s not the problem this time.
Only other oddity is that the user’s spam folder had collected over 16,000 messages so I deleted them. Courier has no problem with thousands of messages, but perhaps it caused Squirrelmail to choke?
Suggestions on where else to look would be appreciated.