Version 2.0+
There is no real default username and password… the username and password are assigned by you during the ListMessenger installation.

Versions 0.9.5 – 1.0.0
The default username and password is the same username and password you are using to connect to your database (located in config.inc.php).

Versions 0.5.0 – 0.9.4
The default username and password for are Username: “admin” and Password: “password”.

In any version it is suggested that you change this through the Control Panel, Preferences, Program Preferences.