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having problem with outlook express?

i am using outlook express by satyam server . i guess each and every setup done is right.and i am able to receive mails but i am not able to send mail through it. it shows this error :- "The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'nityaexports@yahoo.com'. Subject 'lhsdhjhgs', Account: 'imap.sify.com', Server: 'smtp.sify.com', Protocol: SMTP, Server Response: '553 sorry, that domain isn't allowed to be relayed thru this MTA without authentication #5.7.1', Port: 25, Secure(SSL): No, Server Error: 553, Error Number: 0x800CCC79". so what to do to get it right. pls do help...

Public Comments

1. If you are trying to send an email to multiple recipients, one of the recipients email address is invalid, take that email address out and you should be able to send the email.
2. If you are using yahoo email beta you need to upgrade to yahoo mail plus to get the full pop service http://billing.mail.yahoo.com/bm/Upgrades