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...=404 Aug 22 08:47:38 hostname dovecot: imap(username): Disconnected in APPEND (1 msgs, 11 secs, 4907009/42801634 bytes) in=4907094 out=404 Error occured after sending a mail, when client tries to save sent mail in sent-messages folder. (mbox) Typically this is a client problem caused by firewall/virusguard or network erros. But we saw that many different users are effected and we could reproduce this behaviour on clean clients. In our logs and systemd journal we had no hints leading to other error-messages, no dovecot message which tells that limit xy was reached.? Also no hints for other malfun...