ok finally, this appears to be resolved,
my isp blocks port 25 (smtp) so... i have had to use another smtp relay, (thanks ritter for setting one up)
so now all appears to work ok now, using an iptables rule on the firewall (public) as follows:
Code:
iptables -t nat -A PREROUTING -d SMTPSERVERIP -p tcp -m tcp --dport 25 -j DNAT --to-destination SMTPSERVERIP:2525
what happens here is that iptables, takes all port 25's (smtp requests) and diverts them to port 2525
and this appears to have solved the problem,
many thanks to Ritter, and to k0bras for there help with this
cheers
anyweb