iptables -t nat -A POSTROUTING -p tcp --dport 25 -j SNAT --to-source xx.xx.xx.xx https://nixtree.com/blog/change-outgoing-ip-address-for-smtp-using-iptables/
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iptables -t nat -A POSTROUTING -p tcp --dport 25 -j SNAT --to-source xx.xx.xx.xx https://nixtree.com/blog/change-outgoing-ip-address-for-smtp-using-iptables/