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I need to restrict un-authenticated email to only come from my SPAM filtering service, but also allow authenticated users to relay. I have done this in Postini easily, but I have been unable to do this in Kerio. When I set the SMTP service to only allows from certain hosts it blocks all communication, authenticated or not. I would like to avoid doing it at the firewall and making my users use an alternate port.

Chris Green

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I ran into a similar situation. I needed to block all incoming SMTP that doesn't come from our gateway, but still allow authenticated users to send.

It's not ideal, but I used the blacklist. I added 2 ranges to the custom blacklist - to, and to My network and SMTP gateway fall within the subnet, so this blocks all direct connects from the outside except for authenticated users, but still allows me to use relay exceptions for machines within the network. Since my MX doesn't point directly to my mail server, nothing except authenticated users should be connecting directly anyway.

For the first few months this was set up, we'd get tons of blacklist rejections because connections (always spammers) were coming in directly to our mail server. Once they started figuring out that they couldn't deliver mail directly, they started removing our direct IP from their lists. Now, we only get a few a day, and they're all from the same few IP addresses/ranges.

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