Author: Artem S. Tashkinov Date: CC: exim-users Subject: Re: [exim] Ultimate spam defense - check for the sender MX record
Craig Whitmore 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.
>>>
>>> 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.
>
> Thanks
> Craig
>
>
Only few organizations we deal with have SPF system set up, so I've just
given up using it.
