Sendmail trouble with relaying

From: Erik Dörnbach (doernbach_at_elge.de)
Date: 10/31/03

  • Next message: Hoyt Bailey: "Re: GeForce4 MX440 with kernel 2.4.18-bf24" 
    Date: Fri, 31 Oct 2003 16:11:24 +0100
To: <debian-user@lists.debian.org>

    Hi,

    some question, I have a sendmail box running for a number of virtual domains, our main domain is say "aaa.com". I just noticed some funny things starting here, there are some guys using our server against us, by simply opening an smtp connection to us, pretending to be "someone@aaa.com" and sending mail to "someoneelse@aaa.com" - sendmail doesn't see this as a relay or abuse by default.

    How can I make sure the only hosts allowed to send in the name of "aaa.com" belong to a certain network/IP range? Guess I missed out a feature or something? Also how can I avoid having mail with empty sender addresses entering the queue?

    Thanks for help,

    Erik 

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