On 16/05/2025 18:06 EEST Nikolaos Milas via dovecot <dovecot@dovecot.org> wrote: Hello, We are on Dovecot 2.3.18. Some users are occasionally complaining that all mail vanishes from their inbox. However, we cannot find any indication of deletions or expunge in the log. One explanation could be that mail files are deleted externally (at the file system level), but I can't imagine what could cause such deletions. How would you suggest us to troubleshoot this further? We could enable "mail_debug = yes", but this would flood the logs and cause performance drop, and the issue is happening rarely. Any other ideas to troubleshoot these cases in the past (through logs) or monitor (whatever) for the future? (The config is listed at the end.) Thanks in advance. Best regards, Nick The config follows: I would strongly suggest enabling mail_log plugin globally and not just for protocol imap. This should enable you to see why the mails are deleted. Aki