Topic: Roundcube plugin allows self-registering new user accounts
Just found this forum post and YouTube video, it clearly explains how to add a third-party Roundcube plugin, "register" (from http://myroundcube.com/) to allow self-registering new mail user accounts for SQL backends, work well with iRedMail-0.8.3 in production.
 Register plugin Driver for iRedmail: http://myroundcube-plugins.40634.n3.nab … 24584.html
 iRedmail Server – register plugin installation tutorial (postfix driver): http://www.youtube.com/watch?v=ozhFt5ILWr8
 Register plugin: http://myroundcube.com/myroundcube-plug … ter-plugin
*) PostfixAdmin is not required.
*) This plugin should work with iRedMail for both MySQL and PostgreSQL backends.
*) There're many more Roundcube plugins available on myroundcube.com, includes a calendar plugin.
Hope it helps.