Regarding the Mass mailout plugin written by Adam Boardman:

Works great on Mozilla, but not so well on IE (only tried IE8).  With Mozilla the progress page opens in a new window and closes itself when emails have all been sent.  Very nice.  With IE though, the progress page is not a popup window.  Windows ask for closing confirmation, and if you say yes or close it out yourself, the whole site closes.   And if you hit back, all works OK, but get a "Form is missing __token or __ts fields" error message.

Any help would be great!  (FYI:  I'm using 1.7.2).