Article ID: 2512646 - View products that this article applies to.
When you try to send email in Entourage for Mac, you receive the following error message:
Error 5.1.1 firstname.lastname@example.org User unknown.
Explanation: Mail Cannot be Sent. The SMTP server does not recognize any of the authentication methods supported by Entourage. Try changing the SMTP authentication options in Account settings or contact the network administrator.
Account name: "<name>@domain.com"
Step 1: Verify Account SettingsStart Entourage, open the account settings, and then verify that the Internet service provider (ISP) settings are correct. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/980617/ )Set up a Hotmail, Gmail, AOL, or other email account in Entourage for Mac
Step 2: Change Authentication Settings
Step 3: Change the SMTP Port to 587To change the SMTP port to 587, follow these steps:
Article ID: 2512646 - Last Review: March 11, 2011 - Revision: 6.0