Eric Shanbrom (Ipswitch) wrote:
You should block the IP's in the Access Control portion of your SMTP Security settings...The kill list is for blocking addresses that appear in the SMTP envelope FROM field..
We tried that method. It was insane to administrate. We're talking about tens of thousands of IPs. Even the reverse lookups I had going were ridiculously resource expensive. All the solutions I came up with seemed to compound the problem.
While there is nothing in IMail that can handle these types of attacks I have heard some firewalls can do something about them...Black Ice (server edition) is said to be capable of doing the following:
If X ip address causes Y number of errors in Z amount of time then block X for A number of minutes.
IF this is so can someone who has this configured please post this part of the setup. We get asked numerous times about it and I for one would like to have an answer for those that ask.
It would be nice if IMail had greylisting. A little late for us, since we simply went to Postfix with Len's IMGate configs. IMail, and all people writing mail servers, should seriously consider this sort of functionality.
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