Unknown Mail Transport error

Discussion in 'General' started by Chris23, Aug 21, 2019.

  1. Chris23

    Chris23 New Member

    Having quite a few issues with mails that are getting deferred with (unknown mail transport error)
    Nothing has changed in main.cf or master.cf - so not sure where to check. Have done a postfix reload and postsuper -r
    relay=none, delay=1.6, delays=0.57/1/0/0.01, dsn=4.3.0, status=deferred (unknown mail transport error)

    Any advice here?
  2. Chris23

    Chris23 New Member

    Just some more info :
    [email protected]:/etc/postfix# less /var/log/mail.log | grep -i 2EBB240E16
    Aug 21 10:52:20 smtp-02 postfix/smtpd[21316]: 2EBB240E16: client=localhost[]
    Aug 21 10:52:20 smtp-02 postfix/cleanup[22117]: 2EBB240E16: message-id=<[email protected].PROD.OUTLOOK.COM>
    Aug 21 10:52:20 smtp-02 postfix/qmgr[20247]: 2EBB240E16: from=<[email protected]****.co.za>, size=104257, nrcpt=1 (queue active)
    Aug 21 10:52:20 smtp-02 postfix/smtp[22942]: 597C241454: to=<[email protected]****.com>, relay=[]:2526, delay=56, delays=56/0/0/0.64, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 2EBB240E16)Aug 21 10:52:20 smtp-02 postfix/error[23098]: 2EBB240E16: to=<[email protected]****.com>, relay=none, delay=0.64, delays=0.64/0/0/0, dsn=4.3.0, status=deferred (unknown mail transport error)
  3. Taleman

    Taleman Well-Known Member HowtoForge Supporter

    According to Internet Search Engines with
    postfix "unknown mail transport error"
    reason could be mail aliases. If Recipient address has aliases, maybe one of them does not exist?

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