On Thu, Feb 12, 2009 at 07:18:56AM -0500, Wietse Venema wrote:
> /etc/postfix/sender_access:
> /(.*)/ prepend X-Envelope-From: <$1>
>
> /etc/postfix/check_recipient_access:
> /(.*)/ prepend X-Envelope-To: <$1>
>
> Beware, this breaks the privacy of BCC recipients.
Note also that the addresses in question will not be in RFC822 form,
they will in Postfix internal (i.e. de-quoted) form. So for example:
MAIL FROM:<"spaces in this mailbox"@example.com>
will appear as:
X-Envelope-From: spaces in this mail...@example.com
Adding quoting is possible (PCRE):
# Reject addresses with <"> in the localpart or domain
#
/"/ REJECT
# Use dot-a...@domain verbatim (untested)
#
/([^\x00-\x20\x7f-\xff\(\)<>@,;:\\\[\]\.]+(?:\.[^\x00-\x20\x7f-\xff\(\)<>@,;:\\\[\]\.]+)*...@[^@]*)/
PREPEND X-Envelope-From: <$1>
# Everthing else needs quoting:
#
/(.*)@(.*)/ PREPEND X-Envelope-From: <"${1}"@${2}>
provided you are willing to REJECT (often problematic and in any case
rare) addresses whose de-quoted (internal) form contains double-quotes:
<"there are \"quotes\" in this mailbox"@example.com>
If you want to handle these correctly, you need a content filter or
milter with robust address parsing. Note, parsing RFC822 addresses
*correctly* is NOT easy.
--
Viktor.
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