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Could mdbox solve the slow-loading large email issue — if Plesk supported it? We've pinpointed that the slowness is not due to disk I/O or index issues, but rather how Dovecot processes large multipart MIME messages during IMAP FETCH operations. Per cPanel’s documentation: Given that mdbox...

Thanks for the detailed response! A few clarifications based on your suggestions: We've confirmed that this is not just a client-side issue. Even when running: doveadm fetch -u info@domain text mailbox INBOX.Test uid 1 ...directly over SSH, fetching the message takes 10–90+ seconds, while a...

We’re running into major performance issues on our Plesk server when IMAP clients try to open large emails. Some messages (around 30–36MB) take over 90 seconds to load via IMAP (UID FETCH), even though the same message is read almost instantly using cat in the shell. System info: OS: Ubuntu...