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Postfix Changing Outgoing IP By Time Interval Using TCP_TABLE And Perl

email, linux, modules, perl, pop3, postfix, programming, sendmail, smtp 10 Responses »

Nov 152011

Someone asked me if i can make a perl scripts that can change the ip address based on time interval, say he want ip address 1.2.3.4 used within one hour, if done next ip address will be used within next one hour..and so on. when it came to highest number of ip address in array, they will be reset back to the start. first i suggest him to look at the articles i wrote. But then i decide to write Perl script which was made for the purposes mention above.

here we are..

Postfix section:

master.cf
127.0.0.1:2527 inet  n       n       n       -       0      spawn
          user=nobody argv=/etc/postfix/ip_by_time.pl

ip1  unix -       -       n       -       -       smtp
          -o syslog_name=postfix-ip1
          -o smtp_helo_name=smtp1.example.com
          -o smtp_bind_address=1.2.3.1

ip2  unix -       -       n       -       -       smtp
          -o syslog_name=postfix-ip2
          -o smtp_helo_name=smtp2.example.com
          -o smtp_bind_address=1.2.3.2

ip3  unix -       -       n       -       -       smtp
          -o syslog_name=postfix-ip3
          -o smtp_helo_name=smtp3.example.com
          -o smtp_bind_address=1.2.3.3

ip4  unix -       -       n       -       -       smtp
          -o syslog_name=postfix-ip4
          -o smtp_helo_name=smtp4.example.com
          -o smtp_bind_address=1.2.3.4
....
....

main.cf

transport_maps = tcp:[127.0.0.1]:2527
127.0.0.1:2527_time_limit = 3600s

Postfix, Rate Limiting Inbound Emails Using SenderScore And Memcache

dns, dnsbl, dnswl, email, filter, memcached, memory, perl, plugin, postfix 3 Responses »

Aug 152011

I received email from someone fiew days ago, he directed me to an article about senderscore and and asked if I could make it usable. Actually, I’m not very familiar with how senderscore work. I’ve read the article and see the FAQ at https://senderscore.org/. I have found that senderscore can be queried with a format like this:

reversed.ip.address.score.senderscore.com

Ie, I want to know the score value of ip address 202.127.97.97, the format of the query would be like this:

$ dig a 97.97.127.202.score.senderscore.com +short
127.0.4.75

Look at the answers given by senderscore’s NS. last octet is the score of the ip address 202.127.97.97, which scored 75.

Excerpts from senderscore faq:

All scores are based on a scale of 0 to 100, where 0 is the worst, and 100 is the best possible score. A score represents that IP address’s rank as measured against other IP addresses, much like a percentile ranking.

Now back to the article, The authors make a perl module that can perform queries to senderscore ns, put a “reputation score” into memcache, at the same time, calculating how many times an ip address connected to our smtp.

Let’s begin, first of all download Policy::Memcache from this git repository
Create a working directory, and extract the tarball.

$ mkdir pol-mem && cd pol-mem
$ tar --extract --file=petermblair-libemail-f73612c.tar.gz petermblair-libemail-f73612c/perl/senderscore/memcache/
$ mv petermblair-libemail-f73612c/perl/senderscore/memcache/* .

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