The Application supports only TLS 1.0 and that has to be upgraded to TLS 1.2 version which will resolve the issue.
Authentication failed because the remote party has closed the transport stream
Vaishnav P
111
Reputation points
Error log
Failure Sending mail.
Authentication failed because the remote party has closed the transport stream
Not possible to connect to the mail server smpt.office365.com on port 587"
The email Encryption method used is TLS 1.2
PORT:587
SERVER: smpt.office365.com
SSL: yes
Kindly advise, as the issue occurs after 1st Oct 2021