Some friends of mine were running about and saying nice things about greylisting, so I decided to try it and see how it works out. I actually have a full in-exim-implementation now. It would have been cool if exim had some sort of db4 write support or something, but I’ve gone with postgresql instead. The implementation in exim is as follows:

In the main part, I have

Then, in the DATA acl, I have

Why the data part, you may ask. The reason is quite simple, I don’t want to break callouts at all. Also, this server is on 100MBit so I don’t care about any wasted bandwidth.

The table definition is fairly simple:

Hope this helps somebody to get a little less spam.

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