Simple IPTABLES question - accept mail only from select IP addresses


I need to add rules to my snapgear firewall (Linux version 2.4.20-uc0 - ColdFire) to accept mail from only a select few IP addresses, what are the IPTABLES commands I need to add?

This would be very easy using destination NAT, but our firewall is rather old....

Thanks in advance!
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iptables -I FORWARD -p tcp -s selected-IP --dport 25 -j ACCEPT
iptables -I FORWARD -p tcp -d selected-IP --sport 25 -j ACCEPT
# assuming your firewall is not the MTA itself

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omniumnetworkingAuthor Commented:

I will check this out and post back.
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