Hello guys,
I have made a simple filter, following the example here
http://www.postfix.org/FILTER_README.html in order to insert a number in the
subject line of every message been sent.
The script of this filter is very similar with the example, in uses sed to
replace "Subject: " with "Subject: #$number" and autoincrements $number every
time it is triggered.
The filter is defined in master.cf:
# ==========================================================================
# service type private unpriv chroot wakeup maxproc command + args
# (yes) (yes) (yes) (never) (100)
# ==========================================================================
smtp inet n - n - - smtpd
# -o receive_override_options=no_address_mappings
10025 inet n - n - - smtpd
# -o receive_override_options=no_address_mappings
#
.............
nrfilter unix - n n - 10 pipe
flags=Rq user=filter null_sender=
argv=/var/spool/filter/countscript -f ${sender} -- ${recipient}
dovecot unix - n n - - pipe
flags=DRhu user=vmail:vmail argv=/usr/libexec/dovecot/deliver -d $(recipient)
And is triggered from main.cf:
......
sender_bcc_maps = hash:/etc/postfix/maps/sender_bcc
smtpd_recipient_restrictions =
check_sender_access hash:/etc/postfix/maps/sender_nrfilter,
>>(mydomain.tld FILTER nrfilter:)
permit_mynetworks,
permit_sasl_authenticated,
reject_unlisted_recipient,
reject_unauth_destination,
reject_unknown_recipient_domain,
reject_rbl_client sbl-xbl.spamhaus.org,
reject_rbl_client cbl.abuseat.org,
reject_rbl_client bl.spamcop.net,
reject_rbl_client zen.spamhaus.org
Every "filtered" message have to be bcc-ed into a local accout.
This Postfix serves one single virtual domain with virtual users defined in
mysql database.
Now I am asking your advice because:
1. With the above configuration, the filter works ok but in the bcc account I
get 2 messages for each sent message(backscatter I guess).
2. If I enable -o statement for the smtp services, I get only one message in
the bcc but the virtual aliasses are no more recognized by Postfix
So, it will be great if you can give a suggetion on how can I have only 1
message in bcc account keeping active the virtual aliasses.
3. This problem is caused by [email protected], claimig to be a
mydomain.tld user, wich triggers the filter but are finnaly rejected by cbl/rbl
checks.
NOQUEUE: filter: RCPT from
host216-58-dynamic.1-79-r.retail.telecomitalia.it[79.1.58.216]:
<[email protected]>: Sender address
triggers FILTER nrfilter:; from=<[email protected]>
to=<[email protected]> proto=ESMTP helo=<uomo754a9bd9e5>
NOQUEUE: reject: RCPT from
host216-58-dynamic.1-79-r.retail.telecomitalia.it[79.1.58.216]: 450 4.7.1
Service unavailable; Client host [79.1.58.216] blocked using
sbl-xbl.spamhaus.org; http://www.spamhaus.org/query/bl?ip=79.1.58.216;
from=<[email protected]> to=<[email protected]> proto=ESMTP
helo=<uomo754a9bd9e5>
If I move check_sender_access statement after cbl/rbl checks, the filter is no
more triggered by anyone.
Hoping I was clear enough, I am awaiting for your kind suggestions/questions.
--
Best regards,
Tudor mailto:[email protected]
