Author: Peter Bowyer Date: To: Exim, Users Subject: Re: [exim] Ultimate spam defense - check for the sender MX record
On 27/12/06, Artem S. Tashkinov <dummy@???> wrote:
> I would like to increase a spam defense of our server by checking if a
> sender really represents an MX server of his/her organization. So if a
> certain PC is trying to send me an e-mail from user@??? then we
> will check if this person's IP address is within MX servers of
> domain.com, otherwise we'll refuse to accept the mail.
This is misguided. There's no useful correlation between outbound mail
relays and inbound MXs for a large proportion of the internet. Don't
do it.
