mass email sender plugin

I need a plugin that allows me to send occasional updates to members. I installed mass email sender plugin, but now it's telling me I can't email because it's for less than 2500 users. The thing is, most of the users are spammed sites that I haven't deleted because I read in the forums that I shouldn't to prevent them from respamming. So how do I email my network now? Any suggestions.

Also, I went to do an "network update" but it also looked like it was trying update spammed blogs as well as those that are allowed. Is there anyway to keep a blog's spammed status and not have the system consider it an active blog?

Thanks.