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[Steve Wendt]

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?  

Anything that starts with an X is optional, and ignored by mail systems.  This lets 
people add their own stuff without breaking everything... :)

>Could I assume that if the X-Mailer header is missing then most likely the post 
>came from a Microsoft mailer?  :) 

No.

>More to the point, why would an MUA _not_ include the X-Mailer line?

??  programmers don't want to?