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redirect SMTP port (linux) Postfix mail

iptables -t nat -A PREROUTING -d 10.1.1.1 -p tcp --dport 26 -j REDIRECT --to-ports 25

just you need to change the ip to the server ip, i have tried it my self and working fine,

References

http://www.5dollarwhitebox.org/wiki/index.php/Howtos_Basic_IPTables#Port_Redirects

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