Unable to send message from Outlook Express

Dear Friends,

I use outlook express for accessing my rediffmailpro account, some how when i try to sent a message, it shows the following error:

The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was Subject 'Re: Account: ' Server: 'smtp.rediffmailpro.com', Protocol: SMTP, Server Response: '553 sorry, Authentication failed or timed out. Please do get messages first to authenticate yourself.(#4.4.3)', Port: 25, Secure(SSL): No, Server Error: 553, Error Number: 0x800CCC79

after some trials of automatic send-recieve the message gets sent, wonder if i have to send an urgent message how do i do that.

can anyone help.

vishnu
 
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