The commercial mail client from Adamation, called Adam, uses a mail daemon to watch for your mail. BeMail also uses a mail daemon. The BeMail daemon will supersede the Adam daemon if you are running both, and you won’t be able to check multiple accounts or have different popups in the mailbox in the Deskbar.
To fix this problem, make sure you unclick the box for „Autolaunch mail_daemon“ in your email prefs panel. You may need to restart if you already have Adam installed. This currently applies to Adam 1.5.1 – it may change in the future.
Also, try these Adam plugins.