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Gainglaing
Newbie
Joined: 19 December 2024
Location: United States
Online Status: Offline
Posts: 1
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| Posted: 19 December 2024 at 6:18pm | IP Logged
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When i test my SMTP sending from my Microsoft 365 (paid license) mailbox, i first got a SMTP AUTH error. So i turned SMTP AUTH on in M365 admin center, but i am still getting an (different) error.
Any idea what i need to turn on or change ?
Test site:
https://www.gmass.co/smtp-test
Server : smtp.office365.com
Port 587
Security auto
The error:
ERROR: 535: 5.7.139 Authentication unsuccessful, the request did not meet the criteria to be authenticated successfully. Contact your administrator. [MW4P221CA0005.NAMP221.PROD.OUTLOOK.COM 2023-07-21T19:46:46.665Z 08DB88C2A03C3512]
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Igor
AfterLogic Support
Joined: 24 June 2008
Location: United States
Online Status: Offline
Posts: 6113
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| Posted: 19 December 2024 at 10:47pm | IP Logged
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Hello,
Quick Google check offers this discussion thread and this knowledge base article which may help. If that does not help, consider contacting Microsoft support directly.
--
Regards,
Igor, Afterlogic
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Topic: M365 SMTP being blocked
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