Email notifications have stopped working

Hi, I have been receiving email notifications for a long time. I didn't change anything in the settings. Settings according to traccar documentation. It used to work and suddenly it didn't. It's been 6 months, but I didn't find any errors. Java is up to date. Do you know what it could be?

Error:

javax.mail.MessagingException: Could not connect to SMTP host: smtp.seznam.cz, port: 465;
  nested exception is:
    javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure - MessageException (NotificatorMail:36 < NotificationResource:63 < ...)

Are you using latest version of Traccar? If not, I would recommend upgrading.

i have version 4.3 can i upgrade to 4.10 straight or incrementally?

Please read documentation.