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タイトル
Error when configuring the Coordinator to use Office 365 for the SMTP configuration: "The SMTP server requires a secure connection or the client was not authenticated" -
説明
After configuring the Coordinator to use Office 365 (smtp.office365.com) for the SMTP server and clicking Test SMTP, the following error occurs:
"The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM [O365ServerName.prod.outlook.com]."
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対策
Run the following PowerShell command from a Coordinator server to test sending mail to O365:
$msolcred = get-credentialSend-MailMessage –From <FromAddressEnteredOnTheCoordinator> –To user@yourcompany.com –Subject “Test Email” –Body “Test Text” -SmtpServer smtp.office365.com -Credential $msolcred -UseSsl -Port 587NOTE: Enter the credentials specified in the Coordinator SMTP Configuration under the section 'My Server Requires Authentication'. Also test by using -Port 25 instead of -Port 587.If you get the same error, the issue is most likely with either the credentials you are using or the From address itself. Try specifying the credentials using an @onmicrosoft.com account, or contact your Exchange Online provider or network team to troubleshoot this SMTP server-side issue.