Would it be the ports on the so called PC
correct me if I'm wrong, I have read that Ubuntu only has certain ports open and blocks all the rest.
I tried using other mail clients from with in my network to contect to the PC in question, the PC recives mail ok ,but I'm not able to contect to the PC in question to retive the mail
I'm not a big fan of iptables, is there a command line firewall gui that can bring up the firewall, all other ports are open on my router
I'm not sure, but i have ask if my ISP blocks port 25, I dont know if you can view this link