We chose RoundCube after trying a bunch of other webmail applications. Here are some that we tried:

• Bongo (formerly Hula) - could not get it to install
• SquirrelMail - old UI is hard to work with
• Horde (IMP) - complicated setup, does too much
• Zimbra - too integrated with email servers

First, install the prerequisites (and their dependencies):

sudo yum install -y php53-gd php53-intl php53-mbstring php53-xml

Next, create the directory to store the program in:

SITE=webmail.sluug.org
APACHE_USER=apache
sudo mkdir /srv/www/$SITE
sudo chown -R $APACHE_USER:$APACHE_USER /srv/www/$SITE
sudo chmod g+s /srv/www/$SITE

Get the latest version of the RoundCube code from the Subversion repository:

cd /srv/www/$SITE
sudo svn checkout --trust-server-cert --non-interactive https://svn.roundcube.net/trunk . ;# Accept the certificate.
sudo rm -f public
sudo ln -s roundcubemail public
sudo chmod ug+w roundcubemail/logs roundcubemail/temp
sudo chown -R $APACHE_USER:$APACHE_USER roundcubemail

Prepare the MySQL database. Be sure to save the username and password in the /root/.my.cnf file. (Use the real password and username below.)

PASSWORD=$PASSWORD
USER=$USER
sudo -H mysql <<EOF
CREATE DATABASE roundcube;
GRANT ALL PRIVILEGES ON roundcube.* TO $USER@localhost IDENTIFIED BY '$PASSWORD';
FLUSH PRIVILEGES;
EOF

Make sure there's an Apache configuration for the site, and reload the Apache config if necessary.

Browse to http://webmail.sluug.org/installer/.

• Click START INSTALLATION button.
• Make sure all the requirements are met. Try to enable as many of the optional items as well.
• Click NEXT.
• In General Configuration:
  • product_name = SLUUG Webmail
  • CHECK ip_check
  • CHECK Cache messages in local database
• In Database Setup:
  • Database name = roundcube
  • Database user = $USER from above
  • Database password = $PASSWORD from above
• In IMAP Settings:
  • default_host = ssl:/\/sluug.org
  • port = 993 (for IMAPS)
  • username_domain = sluug.org
  • CHECK auto_create_user (allows automatic use for any IMAP user on our system)
• In SMTP Settings:
  • smtp_server = localhost
  • smtp_port = 25
  • smtp_user/smtp_pass = (blank)
• In Display settings & user prefs:
  • pagesize = 12
  • UNCHECK prefer_html
  • CHECK preview_pane
  • draft_autosave = 3 min
• Click on CREATE CONFIG button.
• Save the 2 config files.
  • Note that the download links don't work (they give a default config, not the one you just built); you'll have to cut and paste.
  • Save the files in /srv/www/webmail.sluug.org/roundcubemail/config/ with names of main.inc.php and db.inc.php
• Hit the CONTINUE button.
• The next page will test the config to see if everything is OK.
• The DB Schema will show as NOT OK (Database not initialized)
• Click on the Initialize database button.
• Now the DB Schema should show as OK, along with DB Write and DB Time.
• Next, skip down to the Test SMTP config section.
• Enter a sender and recipient, then click the Send test email button.
• The page should come back with SMTP send: OK.
• Next, skip down to the Test IMAP config section.
• Enter login info for an account on the IMAP server and click Check login.
• The page should come back with IMAP connect: OK.

Additional configuration can be done in the /srv/www/webmail.sluug.org/roundecubemail/config/main.inc.php file.

Remove the installation directory and some other files that are not needed:

cd /srv/www/webmail.sluug.org/public
sudo rm -rf installer/ README INSTALL UPGRADING LICENSE CHANGELOG

NOTE: It is highly recommended to ensure that nobody is logged into the webmail system when upgrading.

First, make a backup of the current version, just in case.

cd /srv/www/webmail.sluug.org
sudo cp -a roundcubemail roundcubemail.backup-`date +'%Y%m%d'`

Since we're using Subversion to download the code, we can simply pull the latest revision. First, check the current revision info:

cd /srv/www/webmail.sluug.org
svn info

Then update to the latest revision:

cd /srv/www/webmail.sluug.org
sudo svn up
svn info

Check the config files, to add any new parameters:

cd /srv/www/webmail.sluug.org
diff -u roundcubemail/config/db.inc.php roundcubemail/config/db.inc.php.dist 
diff -u roundcubemail/config/main.inc.php roundcubemail/config/main.inc.php.dist 

Change anything necessary in the config files, then check the installation by browsing to /installer/.

Once everything checks out, remove the unnecessary files again:

cd /srv/www/webmail.sluug.org/public
sudo rm -rf installer/ README INSTALL UPGRADING LICENSE CHANGELOG

Browse to http://webmail.sluug.org/. Log in with credentials against the IMAP(S) server.

Use PostgreSQL instead of MySQL.

Install PHP FileInfo package, which is optional, but recommended.

Consider configuring the logging differently.