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[John Thompson]

On Fri, 03 Sep 1999 02:35:24 -0400, Kurt Kehler wrote:

>Re: X-Mailer header.  Most mailers include it, but some don't.  Is it
>required or just a courtesy?  Could I assume that if the X-Mailer
>header is missing then most likely the post came from a Microsoft
>mailer?  :) More to the point, why would an MUA _not_ include the
>X-Mailer line?

IIRC< all the "X-nnn:" header lines are optional.

John (john.thompson@ibm.net)