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From: Kai Grossjohann <kai@emptydomain.de>
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Subject: Re: How to avoid resent- headers?
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Steinar Bang <sb@dod.no> writes:

>>>>>> Kai Grossjohann <kai@emptydomain.de>:
>
>> If you pass the message to "sendmail -t", then sendmail will look
>> whether the resent-foo headers exist and use that.  Only if
>> resent-foo does not exist, then sendmail will look at the foo
>> header.
>
> OK.  It's used by sendmail to do the actual resend?

I guess that sendmail.el feeds the message to "/usr/lib/sendmail -t" without
further ado.  /usr/lib/sendmail is then responsible for looking at the
Resent- headers.

>> Search for "Resent-" in smtpmail.el for further information.
>
> Do you mean in sendmail.el?

No.

> smtpmail.el presumably speaks SMTP to hand off the message, and
> doesn't need the message to have resent- headers, at least not when
> sending it off.

smtpmail.el computes the envelope from the resent- headers.

Kai