[exim] Ultimate spam defense - check for the sender MX recor…

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Autor: Artem S. Tashkinov
Data:  
Para: exim-users
Asunto: [exim] Ultimate spam defense - check for the sender MX record
Hello,

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.

Is it feasible? How can I achieve this?

With respect and happy holidays

Artem