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Thread: Limiting hosts for relay

  1. #1
    Join Date
    Jul 2006
    Virginia Beach, VA
    Rep Power

    Default Limiting hosts for relay

    I want to limit the number of hosts that can relay email.

    In Exchange I can say only relay from,, and only for

    Why? Lets say someone gets a virus or rogue application on their computer I don't want these computers sending email. Currently I can log onto any computer on the local subnet and send an email from myself to anyone without authenticating.

    I've tried using
    under the MTA and no luck.

  2. #2
    Join Date
    Oct 2005
    Thatcher, AZ
    Rep Power


    If they are using TLS auth for outlook, etc, I think that trumps mynetworks.
    Turn off TLS, and use mynetworks, and it should work.

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