Re: [Exim] -t and Resent- header lines

Tony Finch wrote:

> Digression: The anti-spam research group has been arguing a lot about
> improving the traceability of email. One of their suggestions is to
> add an RR type to the DNS similar to MX records but for email emitters
> rather than receivers. Email from a machine that isn't listed as one of
> the return path's domain's email emitters is therefore obviously forged.
> However this idea interacts badly with .forward files since they send
> email on without changing the return path. The general opinion seems to
> be that the mailing list BCP of changing the return path when forwarding
> the email should be applied to all forwardings. However this changes
> the way you must deal with bounces that result from .forwardings...
> Anyway, my point is that perhaps Exim might optionally do the Resent-
> thing for redirects when changing the return path.
>
>
Which is a good point. Email forwarded privately should be bounced back
to the forwarder not the original sender if it is to remain private. If
they wish to re-forward email publicly such that any bounce goes back to
the original sender they would have two choices:

Accept the email re-forward it and if a bounce comes back re-forward
that back to the original sender.

or

Tell the sender the new address at smtp recpt time !

--Sean