Can't check external mail through my server
I Have a server with Fedora Core 4, squid proxy, iptables, dovecot (was pop3), sendmail, openwebmail, etc.
On my LAN all works great... but can't check external servers for mail.
On a client (windows) i do a ping to the server and i get response with good conection...
100% packets ok.
but if i do a telnet to the same external server.... my server respond the query.... not the server what i'm try to get data... :(
telnet mail.external.net 110
-> +OK Dovecot Ready....
i'm missing something in the iptables??
i do a echo 1>/proc/sys/net/ipv4/ip_forward
there is a special chain to add to iptables to forward the trafic fomr port 25 and 110 if the address don't match my server?
Thanks in advance!!