I'm not looking to spam anyone, but I am looking for a mass mail plugin so I can select the User Roles (whether core or custom) by check box or comma separated entries of the roles, then type my message and send.
The reason: I have a multi-author website with active contributors, authors and editors. I am looking for a simple way to email these groups.
I don't care if it is a free or premium plugin.
I tried the solution provided below, Emu2 - Email Users 2, but after using it for a few days, I found there is a conflict with the WordPress media uploader, causing http errors on upload with the new WordPress uploader and timeouts using the classic WordPress uploader.