Outlook 2010 Server error: '550 5.1.1 Relaying denied to domain


My outlook 2010 has been working fine until now. I haven't changed my internet provider
or made any changed in the settings.
But for past few days when I try to send emails I get the following massage although I can send emails to my own email. I can receive emails. I have POP3 account type.

Your message did not reach some or all of the intended recipients.
      Subject:    RE: Test
      Sent: 17/09/2013 21:19
The following recipient(s) cannot be reached:
      'Support' on 17/09/2013 21:19
            Server error: '550 5.1.1 Relaying denied to domain yahoo.com'

Kind Regards
IP4IT StaffAsked:
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Jamie McKillopConnect With a Mentor IT ManagerCommented:

Check your outbound SMTP settings. Make sure you are set to authenticate to the SMTP server.

John HurstBusiness Consultant (Owner)Commented:
That particular message generally means what it says.

1. Are you getting your email from Yahoo via POP3?  You need a premium Yahoo account to do that.

2. Are you sending from an email address that is not associated with your POP3 provider? Check what Ports you are now supposed to use (it may have changed to SSL). In Outlook Account Settings, More Settings, check Outgoing Server and authenticate if necessary.

.... Thinkpads_User
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