[Mediawiki-l] MassMail with extension STSGMassMailer

[a. cremer]

Hi,
I try to utilize the STSGMassMailer 
(http://meta.wikimedia.org/wiki/STSGMassMailer) extension in mediawiki 
version 1.9.0
When I access the dedicated special page MassMailer it pops up with no email 
addresses available.
Does it require a special user group to work?
Does anyone have experience with that extension?
Regards
Albert Cremer