Re: Filtering on two headers / checking MX entries ?

Craig Forbes <[email protected]> Wed, 27 Dec 2006 12:16:58 -0600

Newsgroups	gmane.mail.spam.tmda.user
Message-ID	<[email protected]>

On Wed, Dec 27, 2006 at 11:21:17AM -0600, Corey Halpin wrote:
>   Also, does anybody know of a way to check if the origin of an email (as 
> determined by the earliest of the Received headers) is actually an MX?
>   I'd like to avoid sending confirm messages based on email from machines that 
> weren't MXes.

I suspect you will be discarding a good bit of valid email.  I think many ISPs
have outgoing mail servers that are not MXs for their domain.

 -Craig