I found the following website http://plrpromoplugins.com/e-newsletter-sales/ on the internet (I think it was sent to me by plr offer or spam email, don't know it any more exactly)
If I see it right they sell the e-Newsletter Plugin as PLR with and without developer rights and also with resell rights if I understand it right (faq).
I can't imagine that this is allowed by the licence and subscription terms of wpmudev...
Can someone from wpmudev please check the site and give me some feedback.
Thank you in advance.
Greetings from Germany