[HowTo] Replace courier with dovecot

[dexter1983]

Slly me I've edit wrong dovecot.conf
I paste 2 times the same content
It is ok now.
But know I've had another dilema: enable ssl for dovecot:

#ssl_cert_file = /etc/ssl/certs/servername.crt
#ssl_key_file = /etc/ssl/certs/servername.key

Uncoment these lines, but where is it servername.crt and .key
I execute:
openssl req -new -x509 -days 365 -nodes -out /etc/ssl/certs/dovecot.pem -keyout /etc/ssl/private/dovecot.pem