Author: Chris Thompson Date: To: exim-users Subject: Re: [Exim] RBL check suggestions for new version
David Saez Padros <david@???> writes:
> Some suggestions for RBL checks:
>
> - Before RBL check, check that the recipients are existent local
> addresses: If the spammer gets a message telling his server is
> on the RBL he will find some other ways to send spam, when he
> is really trying to send mail to a non existent address.
This sort of assumes that spammers remove addresses from their lists
if they get a response indicating that they doesn't exist. They don't.
We get large amounts of spam for accounts that were cancelled years
ago. I think the record is up to about 8 years now.
