NDR from one domain

Posted on 2008-11-05
Last Modified: 2013-12-09
Lately we have been getting the following NDR when sending email to a particular domain: 16/10/2008 11:46 a.m.
The recipient could not be processed because it would violate the security policy in force
< #5.7.0 smtp;550 5.7.0 Access Denied>

The emails seem get through if we forward our mail through our ISP SMTP server.

What are we doing wrong?
Question by:pAceMakerNZ
    LVL 19

    Accepted Solution

    Try this tool and see if it picks up any errors with your server details.

    LVL 12

    Assisted Solution

    by:Amit Bhatnagar
    It seems the Target Domain has blocked your IP Address. Have you tried talking to the Domain Admin to see if this is actually the case.

    It is quite normal when sometimes machines get infected with Virus or people try spamming (Bulk Mailing) using tools.
    LVL 4

    Author Comment

    No errors - all fine

    I will contact their admin and go from there. Thanks for the input.
    LVL 4

    Expert Comment

    How big is the email you are sending? Could be a size restriction on that mailbox you are emailing.
    LVL 4

    Author Comment

    Don't think it's a size issue. We have sent both simple text and files for testing with no change.
    LVL 4

    Author Comment

    I haven't heard from the other administrator. I have done more tests and it would seem that it's not on our side.
    Thanks for the help

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