If I recall correctly:
a person receives an alert only if their @name is used in the first edition of a post.
An anti-spam measure.
I'll test, by naming someone in a second edition of this post.
It doesn't seem like there will be an easy answer to this. Is it possible to change the location of Thunderbird notifications to a chosen screen? Or to at least change the default location of notifications in window managers, JWM specifically?
On my setup, I have a large screen TV (over 30")...