Email sending failed with error message about TLS

Hello Experts,  We are using EmailTemplate module from Appstore. Recently, we are getting the below error message which is new. Can someone help understand what is going wrong here? Caused by: org.apache.commons.mail.EmailException: Sending the email to the following server failed : <Email server name:port> Caused by: javax.mail.MessagingException: Could not convert socket to TLS Caused by: No appropriate protocol (protocol is disabled or cipher suites are inappropriate)
2 answers

This error you can get when the mail server can not handle TLS 1.2 or higher. Could it be that the mail server you are trying to connect to can only use TLS 1.1?

This error you get when a secure connection is being tried to set up but the client and the server can not find an allowed protocol or cypher to communicate with each other.





The problem looks like it’s secure certificate on the mail server related, so this is the area I would look at.

Do you control the mail server? If you do, has it been updated recently, potentially with a new certificate (self signed?)