On 27/12/2020 15:11, ml_dove...@thorsten-reichelt.de wrote: > And it seems that some folders are never updated in TB. In example I > sort all messages from this list into a "INBOX.Mailinglists.ML-Dovecot" > subfolder by using a simple sieve rule. But even after 10 minutes TB > thinks that there are no new messages. As soon as I click on the > ML-Dovecot folder I see in the /var/log/dovecot-info.log file that TB > logs on to the server and then displays hundreds, of new messages. I > checked twice but I have subscribed to all 228 folders.
I can't help you with your performance problem, but for Thunderbird to check all folders, you need to set "mail.check_all_imap_folders_for_new" to 'true' in the Thunderbird config editor. Regards, Juri
