Dear postfix users community,
Sorry for asking another beginner question. I've seen solutions online
for this, but only one with caveats.
One of my setups involves a forwarding SMTP that handles external
domains, that then forwards them to some other internal mailbox on a
different machine. To do that, I use postfix with virtual_alias_maps to
forward it. I've seen that use case also used to implement catch-alls.
The problem: postfix sets Delivered-To for the final target address it
forwards to. However, it doesn't seem to keep the original envelope-to.
I've seen this solution float around:
main.cf: smtpd_recipient_restrictions = [...], check_recipient_access
pcre:/etc/postfix/prepend_header
/etc/postfix/prepend_header: /(.+)/ PREPEND X-Envelope-To: $1
However, that seems to cause problems when e.g. the original mail was
sent to multiple inboxes at once, e.g. via BCC to multiple ones, and
seems to result in duplicate X-Envelope-To headers. (To be honest I
haven't tried it myself, but I've seen complaints claiming that.)
So is there some nice canonical solution?
Regards,
ell1e
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