Looks like your ISP is blocking port 25.
Get an other ISP, or use the mailserver from your ISP.
Your ISP is PacBell (pacbell.net) right?
ISP's that Block Port 25
This list is not maintained on a regular basis and the information below could have changed since this page was published. It is always a good idea to first check with your Internet Service Provider to obtain the correct smtp information for your account.
ISP's blocking Port 25
Find the full list here