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5.7.1. Unable to relay for

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  • 5.7.1. Unable to relay for

    On occasion we get a situation where a user will be emailing a domain fine, then all of a sudden they will get the 5.7.1 Unable to relay error come back.

    Below is the error we are getting

    The following recipient(s) could not be reached:
    Mike Edwards on 10/04/2007 11:03
    You do not have permission to send to this recipient. For assistance, contact your system administrator.
    <escdomain.local #5.7.1 smtp;550 5.7.1 Unable to relay for MikeEdwards @>

    Any help is appricated


    Last edited by Sembee; 11th April 2007, 22:57. Reason: Edited by Sembee to remove active email address

  • #2
    Re: 5.7.1. Unable to relay for

    Check the followings:
    1. Check with your ISP that you have PTR record for your domain in the DNS.
    2. In the ESM: - ESM:
    Default Virtual SMTP Server - Delivery - Advanced - Fully Qualified Domain name - verify that a real domain name is written (and not something like domain.local), you can check it wuth the "Check DNS".
    3. Check that your domain is not blocked in Black List:
    4. Try the next links:
    5. Can you send to other people in those domains?
    CNE 5, CCA, MCSE NT4.0-2003, MCSE 2003 messaging, Exchange Server MVP.
    Tzahi Kolber - IT Supervisor
    Polycom Israel.


    • #3
      Re: 5.7.1. Unable to relay for

      Check your IP for relaying at Default Virtual SMTP Server




      • #4
        Re: 5.7.1. Unable to relay for

        If your server is announcing itself as escdomain.local then that is something you need to fix first. That will stop some email messages from being delivered.
        The cannot relay message can also mean "go away you look like spam". If the recipient is using multiple email servers then it could be that one server has that configuration and others do not.

        Simon Butler
        Exchange MVP

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