Antispam

I have implemented whitelisting of sender addresses and domains in SQLgrey. Now you can list senders that should never be greylisted, and you can let outgoing email automatically update the whitelist.

One day I started experimenting with DKIM, and configuring my Postfix server to add DKIM signatures to my outgoing email. I quickly found dkimproxy, which is a content-filter for Postfix that implements DKIM.