Re: Post.Office mail-blocking measures

Kitt Diebold ( )
Wed, 18 Mar 1998 09:47:30 -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...

I haven't found any way to do it. I have sent numerous emails to to have them add reverse DNS lookup on the return addresses
and they refuse to do it. They keep saying that it takes too much
processing time. My feeling is that it is worth it. Maybe if enough people
ask/request/demand/beg for it they will add it.

Unfortunately, I'm stuck with Post.Office now since I put enough money into
get my user licenses (though I did get a good deal as an ISP).


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