Cheatshet

Reload postfixsystemctl reload postfix
Aliasespostmap /etc/postfix/virtual
service postfix reload
Restart spamassassin/etc/init.d/spamassassin restart
Restart imap/etc/init.d/courier-imap-ssl restart
/etc/init.d/courier-imap restart
/etc/init.d/courier-authdaemon restart

Relay

Certbot

Listcertbot certificates
Generatecertbot certonly -d mail.flipdare.com

Setup

root@localhost:/etc/courier/old# cd /etc/letsencrypt/live/mail.orbious.com-0001/                                                                                                                                                     
root@localhost:/etc/letsencrypt/live/mail.orbious.com-0001# cat privkey.pem cert.pem > /etc/courier/cert.pem                                   
root@localhost:/etc/letsencrypt/live/mail.orbious.com-0001# tail -20 /etc/courier/dhparams.pem >> /etc/courier/cert.pem   
root@localhost:/etc/letsencrypt/live/mail.orbious.com-0001# cp fullchain.pem /etc/courier/fullchain.pem

- Restart imap and postfix.