Adam Hamer:
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>
>
>
> > Aliasing via virtual(5) is brutally efficient. No content modification,
> > just message routing, so the header is not added.
> >
> > To add an X-Original-Recipient header, messages to multiple recipients
> > have to be split into one copy per-recipient since the header you want
> > is recipient-specific.
> >
> > Since the queue file contains a single copy of the message for all
> > recipients, such rewriting *cannot* happen on input, it can only happen on
> > output via a delivery agent that is processing a single recipient. This
> > means you need a custom transport for this destination that processes
> > mail one recipient at a time and prepends the header.
> >
> > This can be done via an external program via pipe(8) or by modifying the
> > source code of the smtp(8) delivery agent so that the header is added when
> > a suitable boolean flag is set and the message has exactly one recipient.
> >
> > The pipe(8) approach would then re-submit the mail for outbound delivery
> > to a different Postfix instance to avoid loops.
> >
> > --
> > Viktor.
>
> ??Thanks again Viktor.
> It sounds a bit more in depth than I was hoping for. Given the _only_ func
>-tion for this alias is to forward to one address, would it be possible to do
>- a simpler approach??
If it is only for one special case,
/etc/postfix/main.cf
smtpd_recipient_restrictions =
permit_mynetworks
...
reject_unauth_destination
...
check_recipient_access hash:/etc/postfix/recipient_access
/etc/postfix/recipient_access:
u...@example.com PREPEND: X-Original-To: usern...@example.com
If it is for EXIM emulation:
/etc/postfix/main.cf
smtpd_recipient_restrictions =
permit_mynetworks
...
reject_unauth_destination
...
check_recipient_access pcre:/etc/postfix/recipient_access.pcre
/etc/postfix/recipient_access.pcre:
/(.+)/ PREPEND: X-Envelope-To: $1
Either way, if mail has multiple recipients, then they will see
the prepended message header.
Wietse
