On 2020-02-11, ml_dove...@thorsten-reichelt.de <ml_dove...@thorsten-reichelt.de> wrote: > I know that there are many results if I search for "dovecot thunderbird > very slow" on Google but none of them helped me with my problem. :(
Do you have imap compression enabled? I had some problems with that and Thunderbird. > I just don't know where to look for the cause right now, but I can > provide configurations (like output of |doveadm config) |and some logfile= Providing any non-default config is usually helpful.