Update 2023: I've moved this blog post onto our main website, removed comments, and prior steps to fix it as the BitBucket code was fixed.

This is still a fantastic tool! After persistent searching back in 2018, I stumbled upon a valuable plugin on BitBucket that adds support for multiple IMAP accounts in RoundCube. This tool seamlessly integrates a dropdown menu displaying the configured IMAP accounts at the top right corner of RoundCube, replacing the default email address in that location.

Download ident_switch

How to install the multiple identities plugin for RoundCube:

1) Download the ident_switch plugin.
2) Upload the contents to your RoundCube plugin folder i.e. /path/to/roundcube/plugins/ident_switch
3) Edit your /path/to/roundcube/config/config.inc.php file and add ident_switch to the $config['plugins'] variable. It should look something like the following:

$config['plugins'] = array(
    'password',
    'easy_unsubscribe',
    'ident_switch'
);

4) Save the changes and reload RoundCube.