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Cannot post mails (smtp error) - 550 Relaying denied

When attempting to post an email from your PC using an email client (such as outlook express), if you get an error something like:

The message could not be sent because one of the recipients was rejected by the server.
Protocol: SMTP, Server Response: '550 Relaying denied.
...other specific information may be given

The following situations can result in a "Relaying Denied" error:

  1. You are posting from a client that is not inside the campus; only clients in the domain can use the university mail servers for relaying mails.
    Solution: Use Webmail: staff / students.

  2. You are posting from a client that is inside the campus but your computer does not have an entry in the local nameserver, or is not configured properly
    Solution: see IP and DNS settings.

Still dont know what to do?: contact your local computer advisor, or the computer center.

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system manager, University of Gaziantep.