E-Mail Error Codes/Outlook Error 0x800CCC78

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I can't send my email, I'm getting this error:

The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was . Subject: , Account: , Server: , Protocol: SMTP, Server Response: '550 ... Relaying Denied', Port: 25, Secure (SSL): No, Server Error: 550, Error Number: 0x800CCC79

Why can't I send mail?

When you try to send email messages you may receive an error message that your email cannot be sent due to SMTP relay blocking. The exact error message may vary, but it will be something similar to the following:

The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was . Subject: , Account: , Server: , Protocol: SMTP, Server Response: '550 ... Relaying Denied', Port: 25, Secure (SSL): No, Server Error: 550, Error Number: 0x800CCC79

The cause of this error is due to the fact that all our SMTP servers require authentication. Please enable SMTP authentication in your server settings in your email client. Your ISP may block SMTP relaying as well. If they do, you will need to use your ISP SMTP server settings.

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