Requested gave this error: Delivery not authorized, message refused. RRS feed

  • Question

  • Hi all,

    has anyone come across this before?

    I have an issue when a user sends an email to my exchange 2010 server, and includes this url in their signature file,


    The sender receives a bounce back, displaying


    The response from the remote server was:

    571 Delivery not authorized, message refused.


    If I remove or change it to a different url, eg.  www.nasa.gov,  the message is delivered successfully.

    It's so weird, as all other messages are flowing normally.

    Appreciate any assistance.

    Best Regards,

    Michael Walsh


    Wednesday, February 22, 2017 8:09 PM

All replies

  • Do you have any message hygiene (antispam and/or antivirus) system between the Internet and your Exchange server?

    Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."
    Celebrating 20 years of providing Exchange peer support!

    Thursday, February 23, 2017 12:49 AM