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Courier-IMAP is quick and easy to install, but is probably not your best option for running a first class IMAP server. In particularly I have been strongly recommended Cyrus IMAP server. The big advantage to Courier-IMAP is that it can be very easily installed on your LTSP server as a temporary migration tool for email, i.e. to transfer users from Windows to Linux.
$ sudo apt-get install courier-imap
This will prompt whether to create files for use by the web interfaces; it is safe to select "No" here.
Now you need to choose a directory where your mail will live:
$ sudo mkdir -p /opt/imap-mail
Now we need to define our users in the courier-imap user database. There are several ways to do this, including mass conversion of all your users in /etc/passwd using the pw2userdb tool as mentioned in the courier FAQ. Here is what we do to create a single user:
$ sudo touch /etc/courier/userdb $ sudo chmod 600 /etc/courier/userdb $ sudo userdb ~userid~ set uid=<1000> gid=<1000> shell=/bin/bash home=/opt/imap-mail/~userid~
Now you need to set the users password and create the directory that will store all our e-mail:
$ sudo userdbpw -md5 | sudo userdbset systempw $ sudo mkdir -p /opt/imap-mail/ $ sudo maildirmake /opt/imap-mail/ /Maildir $ sudo chown -R <1000>:<1000> /opt/imap-mail/
In the /etc/courier/authdaemonrc file, make sure you set the following value:
authmodulelist="authuserdb"
Note that you may need to replace the existing authmodulelist value. Now prepare the user DB and restart the entire system:
$ sudo makeuserdb $ sudo /etc/init.d/courier-authdaemon stop $ sudo /etc/init.d/courier-imap stop $ sudo /etc/init.d/courier-authdaemon start $ sudo /etc/init.d/courier-imap start
The IMAP system is now ready. See LTSP User Migration for more information.
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