[Mimedefang] Filter modification help needed

[Fred]

Lucas Albers wrote:
> Fred go do man mimedefang-filter and read about:
> PRESERVING RELAY INFORMATION
>
>        This  resets  the relay address and hostname to the actual relay
> address and hostname, unless the message is coming from
>        one of your other MX hosts.

Hello,
You mis-understood my question, I am already doing this by adding X headers.

My needs are to add another header for the MX server of the domain in the
from header.
Example:

A message claims to be from someguy at bus.tld
I want to add a header for the MX records of bus.tld

I've read all man pages, this is not something standard, I don't know much
perl besides regex.  I need to know how to parse the domain from the From
header and query the MX records for it and then add this information to a
header.

I know how to add headers for helo,host,ip these are built in and simple to
do.  I don't know how to tell perl to fetch me the MX records for domain.


>
> Fred said:
>> Hello,
>> I'm wondering if it would be a good idea to add a header for the primary
>> MX
>> server for the domain in the From: header.