Postfix Changing Outgoing IP By Time Interval Using TCP_TABLE And Perl

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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

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Postfix, Omar Kilani’s Memcache Patch Try-Out

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I was rewrote Omar Kilani’s memcache patch couple of weeks ago. But that was not tested due to lack of time and unavailability of servers that can be used.

Now, i got chance to implement simple test. This is my configuration:
main.cf

smtpd_recipient_restrictions =
   ...
   ...
   check_recipient_access memcache:/etc/postfix/memcache.cf,
   ...
   ...

memcache.cf

servers = localhost:11211
key_format = %s

Entry on memcache

spam@example.com	REJECT	not allowed

Query using postmap

$ postmap -q "spam@example.com" memcache:/etc/postfix/memcache.cf
postmap: dict_memcache_lookup: using key_format '%s'
postmap: plmemcache_get: fetching key spam@example.com from memcache
postmap: plmemcache_get: key spam@example.com => REJECT not allowed
postmap: dict_memcache_lookup: spam@example.com returned REJECT not allowed
REJECT not allowed

A little bit too verbose i guess, but it can be adjusted by modifying source code.
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