It's OK, X-Headers are custom headers.

Wilfried Mestdagh wrote:
> Hello,
> I need to add in a special SMTP server some headers in special mails, so
> that users can easy classify them with rules in their email reader.
> I see that many programs add headers and all are prceided with X-, like:
>   X-Text-Classification: normal
>   X-POPFile-Link: http://mail:8080/jump_to_message?view=4479
> Is this normal / best way to do ? If so I think to have domain name in
> it to be exclusive. Any advice is welcome of course.
> --
> Rgds, Wilfried
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