*-* On Tue, 08 Jul 2014, at 16:06:55 -0700,
*-* In Article <[email protected]>,
*-* David E. Ross wrote
*-* About Re: User-agent line not appearing in email
[ ... ]
> For newsgroup messages, the User-Agent header field is indicated in
> RFC 5536 as optional. For E-mail messages, the User-Agent header
> field is not even mentioned. All header fields beginning with X-
> (e.g., X-Mailer) are non-conventional. I strongly doubt that
> Thunderbird recognizes X-Mailer (or any other similar header field)
> as a substitute for User-Agent.
Don't bet any money on that that you can't afford to lose. ;-)
Even my ancient TB 1.5.0.14 recognizes X-Mailer as a User-Agent
equivalent. A few years ago (sometime after TB 1.5.0.14 came out) I
remember seeing some discussion in a bug related to this. The
developers were discussing which strings to add to the list of headers
TB would recognize as User-Agent equivalents. One that I remember
that they added to the list was X-Newsreader. My TB doesn't recognize
it as a User-Agent equivalent, but current versions of TB do recognize it.
Ken Whiton
--
FIDO: 1:132/152
InterNet: [email protected] (remove the obvious to reply)
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