Change outgoing IP address for SMTP using iptables

Here is how you can change outgoing IP address for SMTP using iptables.

On a server, if outgoing email is being blocked by spam filters, It can sometimes get around the problem by using an IPTables rule to force the email out through a different IP address like this:

iptables -t nat -A POSTROUTING -p tcp --dport 25 -j SNAT --to-source xx.xx.xx.xx

Mostly this setting is required for gmail, outgoing email IP can be easily setup in other mail servers.

We hope this information was helpful in change outgoing IP address for SMTP using iptables.

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