I had this very same problem since upgrading to 3.0.5 on lucid. Using the 'Activity Manager' in the tools menu, combined with running TB in debug-mode, I traced this to being subscribed to a non-existant mailbox, probably caused by a bug in the imap server I develop myself.
So apparently, when TB hits a tagged NO response during the STATUS commands it uses to check folders, it will give up on checking the remaining mailboxes. You might consider this a TB bug, but only if you expect clients to degrade gracefully during of server errors. Which imo is not an unusual expectation. You can run TB in debug mode as follows: #!/bin/sh MYDATE=`date "+%Y%m%d_%H%M%S"` NSPR_LOG_MODULES=IMAP:5 NSPR_LOG_FILE=/tmp/thunderbird_${MYDATE}.log export NSPR_LOG_MODULES NSPR_LOG_FILE echo $NSPR_LOG_FILE /usr/bin/thunderbird & exit $? -- check_all_imap_folders_for_new doesn't work in thunderbird https://bugs.launchpad.net/bugs/172929 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs