Allowing Incoming Mail From Specific Hosts

Jeff · *nix forums beginner Joined: 06 Jul 2006 Posts: 1

Have our mail being filtered by a third party so all of our e-mail comes in
through one of there three SMTP servers. How do I modify my config so that
the server will only accept invoming mail from only certain servers? The
server is already setup to only allow relaying via authentication so I want
to continue to allow that. I just want to block the spammers who are
guessing at our mail server address and bypassing the third party servers in
our MX records.

Richard Feldmann · *nix forums addict Joined: 06 Jun 2005 Posts: 62

Using tcpserver to run your service? Just put something like this in your tcp.smtp file (where you include the IPs of those three servers):

1.2.3.4:allow,RELAYCLIENT=""
1.2.3.5:allow,RELAYCLIENT=""
1.2.3.6:allow,RELAYCLIENT=""
:deny

This way, only those three servers get access, all others are denied.

Check out the docs at http://cr.yp.to/ucspi-tcp.html for more info.

Regards,
Richard

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Matthew R. Dempsky · *nix forums Guru Wannabe Joined: 11 Mar 2006 Posts: 110

On Thu, Jul 06, 2006 at 09:03:54AM -0700, Jeff wrote:

Charles Cazabon · *nix forums Guru Joined: 08 Jan 2005 Posts: 805

Jeff <buyer@penslimited.com> wrote:

Google