<550 error> appears when sending to outside address

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A 550 error indicates that the mail server returning the error cannot find the address to which the message was sent(I.E. that user does not exist on the server). If you receive a 550 error in your mail when sending to onther addresses , this usually means that outgoing authentication is not enabled. If your mail does not authenticate with the mail server when sending e-mail, the server will only deliver to e-mail addresses that are setup on that specific server. In order to send to outside addresses, your mail must have outgoing(SMTP) authentication enabled.

Enter Tools > Account settings

Highlight the account you are using for the Mail tab, Select Change or Edit

Then click More settings ,then click outgoing Server tab :

Choose My outgoing server (SMTP) requires authentication.

Make sure that Use same settings as my incoming mail server is selected.

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