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SMTP Authentication to be enabled on mail client

Getting the following undelivery message while sending emails

Delivery has failed to these recipients or groups:

test001@gmail.com (test001@gmail.com) A problem occurred during the delivery of this message to this e-mail address. Try sending this message again. If the problem continues, please contact your helpdesk.

The following organization rejected your message: contoso.com

Solution:

The message error 550 is normally due to SMTP Authentication not enabled on the mail client.

Versions Outlook 98 and later

  1. Select Services on the Outlook Tools menu, which opens the email Services window (If your Tools menu has Accounts instead of Services, use the Outlook Express instructions above)
  2. Highlight the Internet E-mail account, and click the Properties button to show the settings
  3. Click the Servers tab, which shows you all the mail server settings
  4. In the Outgoing Mail Server section, make sure the My server requires authentication checkbox is checked
  5. Click the Settings… button next to it and be sure the Use the same settings as my incoming mail server option is selected.

Follow below article for further clarification

http://www.zensoftware.co.uk/kb/Knowledgebase/How-do-I-configure-my-Outlook-email-client-to-use-SMTP-authentication

 

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