smtp relay abuse

From: Glenn (anonymous_at_discussions.microsoft.com)
Date: 06/21/04

  • Next message: Edwin Davidson: "w2k server sp4 ctl alt del failing." 
    Date: Mon, 21 Jun 2004 13:15:36 -0700

    >-----Original Message-----
    >Running Win 2003 Server as a standalone with POP3
    >mailboxes, I am getting spammers relaying thru the smtp
    >virtual server, even though I have restricted Relay
    >Access by selecting the radio button "Only the List
    >Below", with no computers listed, and have checked the
    >box "Allow all computers that successfully authenticate
    >to relay". Authentication Access has "Anonymous Access"
    >and "Integrated Windows Authentication" checked. (I
    tried
    >unchecking Anonymous Access but that does not stop the
    >unauthorized relay.) It almost seems to me that the
    >spammers are somehow authenticating on this server. Any
    >ideas as to how the spammers are accomplishing the relay
    >and what can be done to stop it. So far, my only remedy
    >has been to stop the smtp virtual server, which of
    course
    >renders my email system inoperable.

    You must uncheck the box that says allow authenticated
    users to relay. You are allowing anonymous access so in
    effect any one that access your mail system is an
    authenticated user. When you do this your POP3 users
    will also not be able to relay. Good Luck
    >
    >.
    >

  • Next message: Edwin Davidson: "w2k server sp4 ctl alt del failing."