Install mail servers

Step 7: Install Web/POP3/IMAP servers
Install either of the following IMAP & POP3 servers (see note):

toaster_setup.pl -s courier toaster_setup.pl -s dovecot

See the Courier_vs_Dovecot page for more info.

If you are switching from Courier IMAP, there are some Migrating to Dovecot issues.