Berikut ini adalah cara install dovecot versi 2.3 di centos 6 dan 7.
Buatlah /etc/yum.repos.d/dovecot.repo
[dovecot-2.3-latest] name=Dovecot 2.3 CentOS $releasever - $basearch baseurl=http://repo.dovecot.org/ce-2.3-latest/centos/$releasever/RPMS/$basearch gpgkey=https://repo.dovecot.org/DOVECOT-REPO-GPG gpgcheck=1 enabled=1
If you are upgrading an existing installation
yum makecache yum update
Sumber : https://repo.dovecot.org