PostFix forwarder - LDAP lookup

marcelloc

check config files with basic and strong header check enabled to see if spf options are included or not.

DQM

Dear Marcello,

Now I have one more problem. It is RBL feature on the PF, it does not work. Below is content of my config file:

/usr/local/etc/postfix/main.cf
#main.cf
#Part of the Postfix package for pfSense
#Copyright (C) 2010 Erik Fonnesbeck
#Copyright (C) 2011 Marcello Coutinho
#All rights reserved.
#DO NOT EDIT THIS FILE

mynetworks = /usr/local/etc/postfix/mynetwork_table
mynetworks_style = host
smtpd_banner = mail-gw-01.abc.com ESMTP
relay_domains = abc.com
transport_maps = hash:/usr/local/etc/postfix/transport
local_recipient_maps =
mydestination =
mynetworks_style = host
message_size_limit = 10240000
default_process_limit = 100
#Just reject after helo,sender,client,recipient tests
smtpd_delay_reject = yes

Don't talk to mail systems that don't know their own hostname.

smtpd_helo_required = yes
smtpd_helo_restrictions =

smtpd_sender_restrictions = reject_unknown_sender_domain,
permit

Allow connections from specified local clients and rbl check everybody else if rbl check are set.

smtpd_client_restrictions = permit_mynetworks,
reject_unauth_destination,
check_sender_access hash:/usr/local/etc/postfix/sender_access,
check_client_access pcre:/usr/local/etc/postfix/cal_pcre,
check_client_access cidr:/usr/local/etc/postfix/cal_cidr
permit

Whitelisting: local clients may specify any destination domain.

#,
smtpd_recipient_restrictions = permit_mynetworks,
reject_unauth_destination,
check_sender_access hash:/usr/local/etc/postfix/sender_access,
check_client_access pcre:/usr/local/etc/postfix/cal_pcre,
check_client_access cidr:/usr/local/etc/postfix/cal_cidr,
reject_spf_invalid_sender,
permit

soft_bounce = yes
postscreen_greet_wait = ${stress?2}${stress:6}s
postscreen_greet_action = enforce
postscreen_access_list = permit_mynetworks,
cidr:/usr/local/etc/postfix/cal_cidr
postscreen_dnsbl_action= enforce
postscreen_blacklist_action= enforce
postscreen_dnsbl_sites=zen.spamhaus.org, bl.spamcop.net
postscreen_dnsbl_threshold=2

Does my config file has any issues? Could you please help to solve it?

Thank you for your support,
DQM

marcelloc

Are you sure it's not working?

the setup is fine and rbl lists are applied on postscreen daemon

postscreen_greet_wait = ${stress?2}${stress:6}s
postscreen_greet_action = enforce
postscreen_access_list = permit_mynetworks,
         cidr:/usr/local/etc/postfix/cal_cidr
postscreen_dnsbl_action= enforce
postscreen_blacklist_action= enforce
postscreen_dnsbl_sites=zen.spamhaus.org, bl.spamcop.net
postscreen_dnsbl_threshold=2

This last arg says that a hostname must be on both lists to get blocked

DQM

Are you sure it's not working?

I'm sure. Because I have tested by telnet from an IP address which is listed on zen.spamhaus.org (I have checked with another SMTP server) but RBL feature on the PF didn't action. So, I am able to push a lot of messages to it.

This last arg says that a hostname must be on both lists to get blocked

This means the IP address which perform sending email must be listed on both zen.spamhaus.org and bl.spamcop.net then RBL feature would action? Right?
Could you please help to explain in details?

Thanks,
DQM

marcelloc

@DQM:

This means the IP address which perform sending email must be listed on both zen.spamhaus.org and bl.spamcop.net then RBL feature would action? Right?
Could you please help to explain in details?

change RBL threshold to 1 on antispam tab, apply config and test again

DQM

Hi Marcello,

I have checked log of PF and I would like to show you as below:

relay=192.168.1.100[192.168.1.100]:25, delay=36, delays=31/0/0/5, dsn=5.7.1, status=bounced (host 192.168.1.100[192.168.1.100] said: 550 5.7.1 IP address 115.73.183.198 has been blocked by the RBL provider zen.spamhaus.org due to rule (Spamhaus). Please check http://www.spamhaus.org/query/bl?ip=115.73.183.198 for further detail. (in reply to end of DATA command))

Highlighted is message that is generated by my Exchange server (not PF) after PF forward the message to it.

Based on the log above, seems the RBL on my PF is working. Correct? But I have a question that why does not PF perform an action (drop, rejetc) spams and generate a message same as my Exchange server? Could you please help on this?

Thanks for your help,
DQM

marcelloc

the man says that postscreen_dnsbl_action set to enforce, logs and rejects the message.
On my config file (postfix forwarder -> view config -> main.cf) is set to enforce.
Can you check on yours config file?

ignore (default)
Ignore the failure of this test. Allow other tests to complete. Repeat this test the next time the client connects. This option is useful for testing and collecting statistics without blocking mail.
enforce
Allow other tests to complete. Reject attempts to deliver mail with a 550 SMTP reply, and log the helo/sender/recipient information. Repeat this test the next time the client connects.
drop
Drop the connection immediately with a 521 SMTP reply. Repeat this test the next time the client connects.
This feature is available in Postfix 2.8.

DQM

Thanks for your support, Marcello. The RBL feature is working well now. But I have one more problem with the log of PF. Once I restart the PF and got log content as below:

Sep 22 10:27:00 fglbh-gw-01 postfix/postfix-script[58210]: warning: not owned by postfix: /var/db/postfix/./2012-09-22.db
Sep 22 10:27:00 fglbh-gw-01 postfix/postfix-script[58529]: warning: not owned by postfix: /var/db/postfix/./2012-09-20.db
Sep 22 10:27:00 fglbh-gw-01 postfix/postfix-script[58872]: warning: not owned by postfix: /var/db/postfix/./2012-09-17.db

So, I couldn't search any incomming messages.

Could you please help to solve on this?

Thank you,
DQM

marcelloc

These files ate not used by postfix daemon, just by package gui.
You can ignore this warning. :)

DQM

Dear Marcello,

But I couldn't search any incomming messages on the GUI, bc it bases on maillog databases.

One more question, Marcello. How about limit size of maillog file and how does it work? Will it split to maillog1, maillog2, …? (/var/log/maillog)
Can I push the log of PF to syslog server?

Thanks,
DQM

marcelloc

@DQM:

One more question, Marcello. How about limit size of maillog file and how does it work? Will it split to maillog1, maillog2, …? (/var/log/maillog)

Not on current version.
LinuxTracker did a how to for logrotate, maybe it's userfull for you.
http://forum.pfsense.org/index.php/topic,51412.msg287633.html#msg287633

@DQM:

Can I push the log of PF to syslog server?

Yes, you need just to change log settings on package gui.

without maillog, you will not have database search too.