Problem in outlook in outgoing mail


New Email

I am facing problem with outgoing mails since yesterday morning, it gives an error as "send test e-mail message: Cannot send the message. Verify the e-mail address in your account properties.
The server responded: 451(check_mail)"
before that it was working perfectly.
For incoming mails working fine, problem with outgoing. Settings for POP3 and SMTP are correct.

Am using windows 7 OS, 64 bit.
Same problem with my other colleagues also.
Overall 15 computers are in a network connected to server.

Waiting for your valuable response.

:thanks: in advance

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