Although this is a squid forum, and not for email or firewall:
Just completely remove the firewall (all ports on all interfaces are open !)
In case, then email is usable, it really is a firewall problem.
Then
Make shure, your clients are allowed access to your mail server, and mail
server cann access internet.
So, something like
#Allow access to mail server
iptables -A INPUT -p tcp --destination-port 25 -j ACCEPT
iptables -A INPUT -p tcp --destination-port 110 -j ACCEPT
should be in your firewall.
You might restrict it to special interface:
iptables -A INPUT -i eth1 -p tcp --destination-port 25 -j
ACCEPT
iptables -A INPUT -i eth0 -p tcp --destination-port 110 -j
ACCEPT
(eth1 local int, eth0 public)
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