Manually copy Let's Encrypt Certificates to Dovecot and Postfix

To manually copy your certificates to dovecot and postfix so that your mail clients do not display a warning about bad certificates follow these steps. You will want to copy the latest certificate which will be located in the folder name starting with your primary domain followed by largest the iteration number.   Copy your private keys cp /etc/letsencrypt/archive/server1.domain.ca-0005/privkey1.pem /etc/dovecot/private/dovecot.pem cp /etc/letsencrypt/archive/server1.domain.ca-0005/privkey1.pem /etc/postfix/postfix.key.pem Copy your certificates cp /etc/letsencrypt/archive/server1.domain.ca-0005/cert1.pem /etc/dovecot/dovecot.pem cp /etc/letsencrypt/archive/server1.domain.ca-0005/cert1.pem /etc/postfix/postfix.cert.pem Copy your fullchain cp /etc/letsencrypt/archive/server1.domain.ca-0005/fullchain1.pem /etc/dovecot/dovecot.ca.pem cp /etc/letsencrypt/archive/server1.domain.ca-0005/fullchain1.pem /etc/postfix/postfix.ca.pem   Restart the Services service dovecot restart service postfix restart