On Wed, Aug 10, 2022 at 07:51:52PM +0200, witcher wrote:
> I'm wondering whether there is an option for sendmail to read the
> "From:" field from a mbox file to fill the envelope sender address
> (like you otherwise would with the `-f` command line flag).
There isn't.
> It doesn't seem to be documented (and thus probably not available) in
> the man page for sendmail, but it seems like it would be a popular
> feature, so I thought I'd ask.
In the Postfix queue file the envelope sender record needs to appear
before any recipient records. This would require the command-line
envelope recipients and (with '-t') any header recipients that appear
before "To:", "Cc:", "Bcc:", "Resent-To:", "Resent-Cc:", "Resent-Bcc:",
to be buffered and emitted only after "From:" is seen. A fatal error
would have to result if there is no "From:" (or "Resent-From:") header.
There's already some code to buffer "header" recipients for '-t'
support, but deferring the sender is a bit more complicated, and perhaps
there are additional barriers beyond the obvious ones. Though it does
not look too difficult at first blush.
As to popularity, I use "mutt", which already supports setting the
envelope sender based on the "From:" header, passing the desired
envelope sender to sendmail(1). I do think this feature rather belongs
in the MUA.
--
Viktor.
