550 Authentication is Required for Relay

 
 
Emails sent from Microsoft Outlook or Outlook Express, not delivered and resulting in a "550 Authentication is required for relay" error.
 
SMTP Authentication in Microsoft Outlook 2010 : 
 
  1. Click on File then select Info and click on Account Settings
  2. Form list of Accounts select your email address and click Change that is above the box containing emails
  3. Click on More Settings, then click on the Outgoing Server tab.
  4. Check the box next to My outgoing server (SMTP) requires authentication and ensure the Use same settings as my incoming mail server is selected. 
  5. Click OK. Then click Next.
  6. Click Finish to complete the configuration. 
 
SMTP Authentication in Microsoft Outlook 2003
 
  1. Click on the Tools menu and select Email Accounts.
  2. Select View or change existing e-mail accounts and click Next.
  3. Select your email address from the list of accounts and click Change
  4. Click on More Settings. Then click on the Outgoing Server tab.
  5. Check the box next to My outgoing server (SMTP) requires authentication and ensure the Use same settings as my incoming mail server is selected. 
  6. Click OK. Then click Next.
  7. Click Finish to complete the configuration.
 
SMTP Authentication in Microsoft Outlook Express
 
  1. Click on the Tools menu and select Accounts.
  2. Select the Mail tab.
  3. Select your email address from the list of accounts and click on Properties. Then click on the Servers tab. 
  4. Under Outgoing Mail Server, check the box next to My server requires authentication.
  5. Click on the Settings button and ensure Use the same setting as my incoming mail server is selected.
  6. Click OK. Then Apply the changes. 
  7. Click OK then Close to complete the configuration.

 

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