Post.Office mail-blocking measures

Josh Hillman ( (no email) )
Wed, 18 Mar 1998 09:24:20 -0500

Does anyone know of a way to have Post.Office 3.1.2 perform a reverse DNS
lookup on incoming mail to aid in the prevention of receiving spam? We
have SendMail (whatever the latest version is) on one of our Unix machines
configured to perform reverse lookup on all incoming mail. If the domain
name in the "From:" field cannot be verified, it rejects the mail.
Unfortunately, our Post.Office still accepts mail with From addresses like
"" and "". We already have huge
lists of complete email addresses, domain names, and usernames to block
mail from, but there's no way to stop all numeric email addresses from
being blocked that I know of...

Thanks for any tips,

Josh Hillman