From: Justin McAleer (pflistfehuq.com)
Date: Fri Aug 17 2007 - 07:29:16 CDT

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The automatic bcc processing appears to only take place on the address
given during the smtp session, and not based on any alias resolution
that takes place afterward. Since the automatic bcc processing is
handled by the cleanup process, I was curious why it was done that way.
If the bcc check was done either during, or after alias resolution, I
can have a simple mysql table with a user's "real" email address and a
bcc recipient, and not have to concern myself with any user or domain
alias changes that take place after setting up a bcc.

Just in case some evidence of this behavior is in order:

recipient_bcc_maps = proxy:mysql:/etc/postfix/maps/sql/mysql-bcc.cf

/etc/postfix/maps/sql/mysql-bcc.cf:
hosts = mysql.example.com
user = example
password = example
dbname = example_db
domain = cdb:/etc/postfix/maps/real_domains
query = select bcc from autobcc where user = '%s';

Message log:

Here, userexample.com is in the mysql map such that a bcc should be
sent to bcc_addrexample.com. userexample.com has an alias of
user-aliasexample.net. These two entries show a message to
userexample.com and a message to user-aliasexample.net:

Aug 16 08:01:50 dev2 postfix/qmgr[3499]: EB68517EB2:
from=<senderexample.com>, size=642, nrcpt=1 (queue active)
Aug 16 08:01:51 dev2 postfix/smtp[3500]: EB68517EB2:
to=<userexample.com>, orig_to=<user-aliasexample.net>,
relay=relay-v.neonova.net[137.118.16.66]:25, delay=0.09,
delays=0.04/0/0/0.05, dsn=2.0.0, status=sent (250 889298641 message
accepted for delivery)
Aug 16 08:01:51 dev2 postfix/qmgr[3499]: EB68517EB2: removed

Aug 16 08:01:12 dev2 postfix/qmgr[3499]: C7A7517EB2:
from=<senderexample.com>, size=645, nrcpt=2 (queue active)
Aug 16 08:01:12 dev2 postfix/smtp[3500]: C7A7517EB2:
to=<bcc_addrexample.com>, relay=relay-v.neonova.net[137.118.16.66]:25,
delay=0.13, delays=0.08/0.01/0/0.04, dsn=2.0.0, status=sent (250
876937351 message accepted for delivery)
Aug 16 08:01:12 dev2 postfix/smtp[3501]: C7A7517EB2:
to=<userexample.com>, relay=relay-v.neonova.net[137.118.16.66]:25,
delay=0.13, delays=0.08/0.01/0/0.05, dsn=2.0.0, status=sent (250
876937352 message accepted for delivery)
Aug 16 08:01:12 dev2 postfix/qmgr[3499]: C7A7517EB2: removed

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