milter-greylist

Hi,

A few words on milter-greylist, especially because the new version (3) is now RC6 and looks pretty stable. What are the features of milter-greylist?

• Per-domain and per-user settings.
• Friendly networks whitelisting
• Multi-MX sync (database is replicated many mail servers if needed)
• SMTP-AUTH support
• SPF records: can be configured not to impose GreyListing to messages that are SPF-compliant
• Access lists with DNSbls

This last option is new in version 3. It is very nice: it allows one to configure milter-greylist to impose GreyListing if the source IP is on (configurable) DNS black lists (DNSbls).

I’ve installed it and it decreased the number of messages/day by about 60%. I only had to whitelist one server.

Sendmail milters from SnertSoft

This is just a quick post to encourage people to try SnertSoft’s excellent anti-spam milters. If you’re running a spam-filtering gateway, you may want to try milter-ahead. It checks at the backend mail server if the user exists before accepting the message.

Milter-sender is also very interesting, it checks for the existence of the sender’s e-mail before accepting the message.

Milter-link checks for URL in message bodies againsts URI blacklists. And this one is free! (most are).

All the milters’ descriptions are here.

Anthony, the author, is very kind and offers good support. Have a look at his website. There are many other milters that may help you reduce the load on your spam-filtering system and reduce the number of spams that make it to your user’s mailbox!