This project is closed due to personal reasons. If somebody wants to take over the project - please let me know.
A new plugin version is out. It supports SquirrelMail 1.4 and new types of data sources.
Version 0.8 of the RetrieveUserData plugin are available for download. It works together with Squirrelmail 1.2.5 (http://www.squirrelmail.org/) and hopefully later releases. You can use LDAP, MySQL and /etc/passwd as source for name and e-mail address of your Squirrelmail users, preventing them from configuration of Squirrelmail on first use. Earlier versions are also available.