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Hi amine.bensaad,
Are you able to show us your mail logs from inside virtualmin?
When you say IMAP is not syncing, is that also the case with Usermin? Or is it only when you try to open emails in your desktop pc/or mobile phone email Outlook app?
Did you try changing from START TLS/SSL to just SSL (PORT 465 and 993)?
https://ajecreative.com.au