How can I know if a user is connecting to email correctly using SSL on IMAP and/or POP3

Hello, I recently had a problem with the SSL certificates of one of my cPanel accounts because the AutoSSL feature couldn"t renew the certificates due to a blockage caused by the Cloudflare proxy. So I ended purchasing a SSL certificate from PositiveSSL for the hostname mail.mydomain.com which is the most problematic due to the requirements from Apple email clients, however I still don"t know if all of my users are connecting with SSL or TLS. Is there a way to know that from the exim_log or maillog files?