Route mail traffic through secondary IP address on Linux
In the event that you have an IP address that is listed on a blacklist you can modify your server's IPtables configuration to reroute port 25 traffic to a secondary IP.
Use the following command to modify your routing tables:
# iptables -t nat -A POSTROUTING -o eth0 -p tcp -j SNAT --dport 25 --to-source 220.127.116.11
Be sure to replace 18.104.22.168 with your secondary IP!
You must have a secondary IP address for this to work. If you do not you may request one by creating a ticket in your Control Panel. Please note that a new IP address will require your server to be rebooted and will have an additional charge applied to your account each month.
--Kelly Koehn 10:54, 30 October 2009 (CDT)
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