X-Mailer vs User-Agent

[Simon Josefsson]

Hi!  I have noticed that in the e-mails I send using GNU MailUtils mail,
there is a X-Mailer header added.  What do you think about using
User-Agent instead?  The header is specified for netnews in
<https://tools.ietf.org/html/rfc5536#section-3.2.13> but many e-mail
clients use it today, but I can't find a better reference than this one.

I would have proposed a patch, but I see that there are some command
line parameters related to this header that make patching things a bit
complicated, so I thought I'd just mention it instead.

Thanks,
/Simon

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