Author: Craig Whitmore Date: To: Marc Perkel, Artem S. Tashkinov CC: exim-users Subject: Re: [exim] Ultimate spam defense - check for the sender MX record
>> 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?
>>
If a domain has set up SPF or SenderID records then you can use those so
make sure the emails are coming from the correct places.
