From your post's headers: Outlook Express 6.00.2900.2180

First check in at http://windowsupdate.microsoft.com, install all critical
updates offered & reboot. If you're still unable to send, post the complete
(verbatim) error message you get when the message fails to send.


ramananda wrote:
Dear Sir,
unable send the mail, Pl advice
Regards
Rao