On Thu, Apr 24, 2025 at 10:21:37AM +0300, Mike Teplynin via Postfix-users wrote:
> On Thu, Apr 24, 2025 at 9:46 AM Viktor Dukhovni via Postfix-users
> <postfix-users@postfix.org> wrote:
>
> > Well, that's rather important information, that wasn't originally
> > provided. So this an email archiving use case. In that case,
> > might it not be possibl/desirable to archive a separate copy
> > of each message, that isn't the copy delivered to the user?
>
> Yes, it's about email archiving on edge server, even before relaying
> messages to internal servers for checking for spam, viruses, etc.
> Currently i'm adding headers in the messages and then do always_bcc
> for send to storage server. I don't need to keep separate copies of
> letters for each user, it is enough to save the original letter, but
> with adding some information from the smtp session (evelope from,
> envelope to, and may be hello too).
>
> As I mentioned earlier, full session log from Sendmail was perfect
> solution for us, but Postfix does not have such functionality.
So you are generating separate copies (always_bcc), but you SHOULD
instead use "recipient_bcc_maps", which makes it possible to encode the
original address in the localpart of the per-recipient Bcc address,
and the resulting envelope can be moved into the message content or
headers as part of the bcc delivery process somewhere along the path.
main.cf:
indexed = ${default_database_type}:${config_directory}/
pcre = pcre:${config_directory}/
recipient_bcc_maps = ${pcre}rcpt_bcc.pcre
transport_maps = ${indexed}transport
rcpt_bcc.pcre:
# Handle quoted localparts first
/^"(.*)"@(.*)/ "rcpt-bcc+$1@$2"@quoted.bcc.invalid
# Then the rest
/^(.*)@(.*)/ "rcpt-bcc+$1@$2"@bcc.invalid
transport:
# Set RHS as desired, receiving SMTP server
# can transform the message as desired, decoding
# the "rcpt-bcc+(...)@....bcc.invalid" addresses to
# recover the original form.
bcc.invalid relay:[archive.example]:12345
.bcc.invalid relay:[archive.example]:12345
This is a sketch, fill in the details and test with care.
--
Viktor.
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