[Mimedefang] duplicate subject headers {Scanned by vsl mailsafe}

[Kenneth Porter]

--On Friday, March 27, 2009 9:55 AM -0400 "Kevin A. McGrail" 
<kmcgrail at pccc.com> wrote:

> I think rejecting may be draconian but it would be interesting to track
> the amount of legitimate mail with two subject headers.  I can see a lot
> of filters/gateways accidentally adding this to legitimate mail,
> unfortunately.

Does such a thing as an "RFC 2822 validator" exist? Something that checks a 
message for conformance?