Error 451 outgoing mail

Discussion in 'ISPConfig 3 Priority Support' started by LTBL SRL, Nov 8, 2017.

  1. LTBL SRL

    LTBL SRL New Member HowtoForge Supporter

    Hi,
    in outgoing email i've - with some domains - this error:
    said: 451 <[email protected]> unable to verify address (in reply to MAIL FROM command))
    What i must check for this error?

    Thanks.
     
  2. till

    till Super Moderator Staff Member ISPConfig Developer

    Check the dns records of the FROM and REPLYTO address of these emails. Seems as if the other servers are not able to verify the address. You can check DNS records e.g. with intodns.com.
     
  3. LTBL SRL

    LTBL SRL New Member HowtoForge Supporter

    Hi Tll,
    https://intodns.com/airbonaita.it
    everythings seems ok.
    But is possible that the user have some misconfigured error in mail client?
    Have you some site where is possible to check more blacklist then mxtools?
     

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