Reason for reject: This error message shows that emails are not delivered to the mailbox the mail server can’t find this email account on the server. NOQUEUE: reject: RCPT from : 550 5.1.1 : Recipient address rejected: User unknown in virtual mailbox table from= to= proto=ESMTP helo= : Recipient address rejected: User unknown in virtual mailbox table This is one of the common errors in Postfix mail servers when users send emails to their local mailboxes.īounce back: 550. Mails getting detected as spam by the spam filter.Here are a few of the most common bounce back messages that you may encounter during email sending or receiving:
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