Arun,
On Mon, Dec 15, 2008 at 3:24 PM, Arun Khan knura@yahoo.com >
Not related to WiMax but Reliance Broadband help desk told one of my colleague that she needed to buy a static ip address (Rs. 2K/yr) to send outgoing messages from Thunderbird client over port 25. Ditto for Outlook. :(
Nowadays, all SMTP submission is done over SSL port which is generally 993. You need Port 25 only if you want to run your own mail server or your mail provider does not give secure submission.
Please check if the other SMTP submission port(s) are open.
-- Arun Khan
HTH. With regards,