[exim] testing the ip agains the domain MX record.

hello
it's possible to verify if an incomming smtp connection is generated by the MX record for the domain listed in
the from field of the header.
i want to verify this so i can make sure that every mail i accept is comming from one of the mail servers of that domain. i can't find
any option for this check. only verify = sender but this is not what i'm looking for.
thanks in advance.