In order to stop people using your email account to send random emails or spam through it we require that email clients authenticate themselves with the mail server before they can send email.
If you receive "550 SMTP AUTH is required for message submission" when trying to send your email then it means that your email client isn't authenticating before sending or you have the wrong password.
To enable your email client to authenticate before sending:
Outlook 2010 and later
- Open Outlook
- Go to the File tab
- Go to Info section
- Click account Settings next to the account to modify, click account settings again
- Select the email account from the list and click the Change button
- In the Outgoing mail server (SMTP) box you should have mail.yourdomain.com (replace with your domain name)
- Click More Settings
- Select the Outgoing Server tab
- Tick My outgoing server (SMTP) requires authentication
- Select, Use same settings as my incoming mail server
- Click Ok, the dialog should close
- Click Next then Finish
- In the account settings windows click close
You should be at the main outlook screen at this point, close outlook and open it again, then try sending email and it should work.
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