Install mail servers
From The Network People, Inc.
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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
and then a webmail client or three:
toaster_setup.pl -s squirrelmail toaster_setup.pl -s sqwebmail toaster_setup.pl -s roundcube
There is also support for v-webmail on the Mail Toaster login page but it must be manually installed. Edit mt-top.html to select which webmail interfaces are presented as options to your users.
Courier -vs- Dovecot -vs- Binc
Courier has been the default IMAP server for many years. However, vpopmail support has always been a second class citizen to most of the courier developers. It has also been a persistent nuisance to keep working reliably due to frequent changes. However, it works well, scales well, and is still a supported feature of Mail Toaster.
BincIMAP = Binc is not Courier = a replacement for Courier. I evaluated it a long time ago and wasn't impressed. I don't remember why, but IIRC, my biggest complaints were performance related.
Then came Dovecot. I've watched the project for well over a year and have had Dovecot running on a personal mail server. Other than being a pain to get set up (because there wasn't any docs yet!) so long ago, it has been an extremely dependable POP3/IMAP server. It also builds much, much faster than Courier. Configuration is not yet intuitive but is no longer frightening. I highly recommend Dovecot.
There are some known Migrating to Dovecot that should be reviewed prior to switching.
Sqwebmail FreeBSD note
