Setup SSL for Exim and Dovecot

1. need to locate where the SSL for Exim should to be:
grep "tls_certificate\|tls_privatekey" /etc/exim/exim.conf
tls_certificate = /etc/exim/ssl/exim.crt
tls_privatekey = /etc/exim/ssl/exim.key

2. now we can update the SSL with valid certificate for our hostname:
file /etc/exim/ssl/exim.key should store private key for your domain
file /etc/exim/ssl/exim.crt should store certificate + ca-bundle for your domain

3.Now time to update Dovecot with the following lines or replace them:
ssl_cert =