Error message "553: Sorry, that domain isn't in my list of allowed rcpthosts"

The reason for the error "553 sorry, that domain isn't in my list of allowed rcpthosts" is that your mail application has not authenticated to our mail server.

In order toThe reason for the error "553 sorry, that domain isn't in my list of allowed rcpthosts" is that your mail application has not authenticated to our mail server.

In order to send mail through our server, your email program must enable SMTP authentication.

Microsoft Outlook

  1. Open Outlook
  2. From the Tools menu select Account Settings. The Account Settings box appears.
  3. Verify that the E-mail tab is selected.
  4. Click on the account to highlight it, and click on the Change icon above it. The Internet E-mail Settings appear.
  5. Under the Server Information section, in the box marked Outgoing mail server (SMTP) change the entry mail.YOURDOMAIN.co.za
  6. Click the button More Settings... in the lower right-hand corner. The Internet Email Settings box appears.
  7. Click on the tab Outgoing Server.
  8. Click the check box My outgoing server (SMTP) requires authentication, and verify that the circle-box Use same settings as my incoming mail server is selected.
  9. Click OK to close the Internet Email Settings box.
  10. Click the Finish button to close the Internet E-mail Settings box.
  11. Click the Close button to close the Account Settings box. 
  12. SMTP authentication has now been enabled.

Using Outlook Express

  1. Click ‘Tools’ from the email client menu
  2. Select ‘Accounts’
  3. From the pop-up, select the ‘Mail’ tab
  4. Click ‘Properties’.
  5. Select the ‘Servers’ tab
  6. Ensure that the checkbox for ‘My server requires authentication’ is ticked
  7. Click the ‘Settings’ button next to ‘My server requires authentication’
  8. Ensure that the first option, ‘Use same settings as outgoing server’, is selected
  9. Select the ‘Advanced’ tab
  10. Set the Outgoing Server (SMTP) Port to 587
  11. The Incoming Server (POP) Port should be set to the default setting, 110
  12. Click ‘OK’ to save these settings
  13. Click ‘OK’ and ‘Close’
  14. SMTP authentication has now been enabled
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