Jessie (8.0)¶ Create /etc/apt/trusted.gpg.d/dovecot.gpg curl https://repo.dovecot.org/DOVECOT-REPO-GPG | gpg --import gpg --export ED409DA1 > /etc/apt/trusted.gpg.d/dovecot.gpg Create /etc/apt/sources.list.d/dovecot.list. If you want to use https, make sure…