[ZendTo] SMTP authentication on Exchange Online suddenly not working

arnaud Chevalier arnaud_chevalier at hotmail.fr
Wed Jul 6 17:08:44 BST 2022

Dear all,

I hope you are fine.

I have a sudden issue on my ZendTo (v6.11-2), I can't connect anymore through the smtp authentication on Exhange Online. (smtp.office365.com / port 587 / tls on)
But the account used to send daily reports email, can connect on the smtp of exchange online and send emails... So the smtp authentiction obviously working fine...

MFA is not activated on the account.
There have been no change on my ZendTo install or on the OS.

Do you have an idea?

Thank you very much.


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