Mail Extension not not sending mails

[AP_10343008]

Mail Extension was working fine`in thingworx server. Recently the server is upgraded to Ad-SSO. Now iam receiving the following error while sending mail. Kindly check and let me know what changes need to be done. 

Error1: Error sending email due to [535 5.7.139 Authentication unsuccessful, basic authentication is disabled. [CH0PR03CA0269.namprd03.prod.outlook.com 2023-05-24T22:00:45.009Z 08DB5C453072A169]_].The last server response was [535 5.7.139 Authentication unsuccessful, basic authentication is disabled. [CH0PR03CA0269.namprd03.prod.outlook.com 2023-05-24T22:00:45.009Z 08DB5C453072A169]_] with return code [535].The error originated on host xxxxx.

Error2: Error sending email due to [Could not connect to SMTP host: smtp.office365.com, port: 587].The last server response was [null] with return code [0].The error originated on host 

[nmutter]

I can just give some more context to the issue:

- Error you receive is "basic authentication is disabled". Seems like the MailExtension wants to use Basic Authentication, but your mail server has this disabled

- There was this thread some time ago regarding "basic authentication" https://community.ptc.com/t5/ThingWorx-Developers/Mail-extension-with-modern-authentication-type/m-p/826729#M59808 Theres also a PTC article reference which might help "SMTP Password Auth may be automatically disabled if MSFT detects you are not currently using SMTP Auth. But it can be enabled using a Exchange Online PowerShell Script"

Maybe it helps.

[AP_10343008]

In configuration, we changed SMTP Server from outlook domain to client domain. And added their mail username and password in configuration.

[nmutter]

I see. You tried before without any credentials? In this case you resolved the issue by using correct smpt server and providing username and password? If so you can close the topic with your answer as solution I guess

[AP_10343008 · Accepted solution]

Once the server is upgraded with ADSSO, it is not accepting outlook domain name, username and password. So we changed SMTP Server from outlook domain to client domain.