In https://sourceforge.net/p/squirrelmail/bugs/2799/#ffc5 Thomas Baumann pointed out that the problem is apparently caused by inexisting yet subscribed folders.
I can confirm that non-existing "folders" cause or can cause the link to the INBOX folder to be missing on Courier and Dovecot, probably also on other servers. In fact, the bug probably does not depend on the size of the folder tree. On my Dovecot server I could reproduce the problem even with a folder tree of only 20 entries. Removing the inexisting folders from .subscriptions (Dovecot) or courierimapsubscribed (Courier) works around the bug. -- -- Andreas -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org