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We have released BestSync 2022 Version 17.0.0.5.
The new version supported NTLM authentication when it sends emails through IIS's SMTP service.
Please try the new version to see if it resolved the problem.
I'm sorry that we only implement new features on the newest version.
i tried the new version. Sadly it doesn't work yet.
I've added a new screenshot. NTLM authentication starts but gives back a wrong authentication. If you compare the new screenshot with the third one above, you can see, that the encrypted part is different from the working one in my test.
Regards
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2022-02-02 08_26_37-Window.png (9.79 KiB) Viewed 41721 times
We have tested on our Windows Server 2019, BestSync worked fine.
Could you please tell me the version of you windows server, or is it possible that you create a test account for us to debug this problem?
You can send the test account to risefly@risefly.com.
From the log message, I can see that you have not enabled the "Integrated Windows Authentication" option in the "Authentication" settings of the "properties" setting of the SMTP server.
We have installed a Windows Server 2012 server and Tested the Email function of BestSync, the function worked fine in the test.
on Windows Server 2012 it doesn't work for me. But on Windows Server 2016 it does! (I had forgotten to set the recipient and so the test mail went into nirvana... )
Because Windows Server 2016 is the destination os on which currently BestSync 2019 is running, I hope that the mail sending will work on that system If not I'll get in touch with you again.