> Imre Gergely
> > The issue is that I can telnet into it internally with no problem but
> > cannot reach it externally. I hooked up wireshark and if I'm
> > interpreting it correctly I do find the initial SYN come in but no
> > connection is established. My reading suggests that I may have an
> I would check some basics first.
>
> Is postfix listening on the external IP address? If not, see
> inet_interfaces in main.cf (man 5 postconf)
>
> sudo netstat -nlp |grep master |grep tcp
>
> Is the firewall really off? Try this:
>
> iptables -I INPUT 1 -p tcp --dport 25 -j ACCEPT
>
> This should accept connections to the SMTP port from anywhere.
Am I interpreting this correctly that it should be listening on any IP without
any firewall rules?
> sudo netstat -nlp |grep master |grep tcp
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 4375/master
tcp6 0 0 :::25 :::* LISTEN 4375/master
> sudo iptables -L
Chain INPUT (policy ACCEPT)
target prot opt source destination
LOG tcp -- anywhere anywhere tcp dpt:smtp
LOG level warning
Chain FORWARD (policy ACCEPT)
target prot opt source destination
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
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