It's will show User doesn't exist when account is alias.

akong

Well-Known Member
Oct 15, 2018
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Hello,
Some mail will quarantine.But if recivier account alias.I deliver mail is will show User doesn't exist.Please see attachment.I use thunderbird send mail to this alias account is ok.Please check it.
 

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This error message is generate by your server (mail.eshtec.com.tw), so there must be something wrong there.