[Plugin: Peter’s Collaboration E-mails] Only seems to work if I specify 1 admin

This plugin works great when I define one admin to receive e-mails when posts are submitted for review – but when I start adding additional e-mail addresses I no longer receive any e-mails at all.

Has anyone else had this issue?

Thanks so much!

http://wordpress.org/extend/plugins/peters-collaboration-e-mails/