Mail bypassing Spam filter |
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brighamnet 
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 Topic: Mail bypassing Spam filterPosted: 04 December 2004 at 6:29pm |
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Here is my dilemma. I have spam filter running on a server relay.xxx.com ip address xxx.xxx.xxx.11 My mail server is on mail.xxx.com ip address xxx.xxx.xxx.4 my MX record for domain.com is configured with a single MXrecord pointing to relay.xxx.com I am finding several hundred messages per day that are bypassing the relay server and being delivered directly to the mail server. Is there something I missed in the configuration or some way I can block all messages except those from the relay server from being delivered. Thanks for your time. |
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Hemlock
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Posted: 04 December 2004 at 10:52pm |
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It's possible that the spammers try mail.whatever when the real MX fails, or maybe you have your DNS reversed ;)
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Desperado
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Joined: 27 January 2005 Location: United States Status: Offline Points: 1143 |
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Posted: 05 December 2004 at 8:03am |
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The server on the dot 4 ip address should be configured to only allow connections from the SpamFilter IP and any client IP's that are allowed to use it as an outbound relay. This is usually a simple configuration on the mail server application OR .. you can block port 25 commections to that ip at the router which is what we do. Dan S.
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