Quality Assurance Analyst
Staff member
Oct 2, 2010
somewhere over the rainbow
cPanel Access Level
Root Administrator
The advantage of Dovecot is that it has a lower memory footprint, so it can work better on lower memory systems (such as VPS for example). The advantage of Courier is that it can handle time skews and mailbox corruption better than Dovecot.

The default should be Dovecot for new cPanel installs to my knowledge. We tested this recently on a new cPanel install, and Dovecot was the one selected during the initial WHM wizard. You can always select either during that wizard, though.