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smtp; 553 Terminating connection as the sender is spoofed

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  • smtp; 553 Terminating connection as the sender is spoofed

    When trying to send emails to this domain comes up with the following NDR
    The following recipient(s) could not be reached:

    [email protected] on 18/10/06 08:18
    The format of the e-mail address is incorrect. Check the address, look up the recipient in the Address Book, or contact the recipient directly to find out the correct address.
    < sf1430.xtra.co.nz #5.1.3 smtp; 553 Terminating connection as the sender is spoofed.>

    The client email address does exist

  • #2
    Re: smtp; 553 Terminating connection as the sender is spoofed

    This kind of NDR indicates that something with the recipient email address is wrong, maybe you misspelled the recipient email address.

    I suggest that you contact the system admin on the recipient's side and test is with him.
    CNE 5, CCA, MCSE NT4.0-2003, MCSE 2003 messaging, Exchange Server MVP.
    Tzahi Kolber - IT Supervisor
    Polycom Israel.

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    • #3
      Re: smtp; 553 Terminating connection as the sender is spoofed

      the part "553 Terminating connection as the sender is spoofed" looks like that the recipient exchange looks for some records for your domain (sender) and dont find them... so he thinks its spoof... maybe they work with SPF and you dont have such records?
      MCSE 2000 Done
      RHCE Done

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