to disable non-encrypted pop3/imap, comment out plain pop3 and imap entries in
/etc/dovecot/conf.d/10-master.conf
See
Dovecot's SSL page
/etc/pki/dovecot/dovecot-openssl.cnf
/usr/libexec/dovecot/mkcert.sh
Why you want REAL, verified certificates.
Extra stuff:
A starting point for SMTP AUTH for sendmail...
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