I certainly used to receive loads of mailers that fit this description of how things work (with CR related servers appearing to have been used for the sending). Things do seem different now, and I have been assured that this operating model isn't true. They were welcome offers for the various CR properties, and I got them regardless of whether or not I already had an account there.
The normal model (which IS the true one according to CR), is that the program provides creative for affiliates to use, but affiliates have to compile their own mailing lists and do so according to the local regulations in the markets they target
From my experience all programs or most have creatives to use, This is why I was surprised as why would a program state things such as mailers list or a mass mailer,
Over the weekend I am going to log in to my affiliate email account, I gave up a while ago and put things on hold so its been a while, Hopeful I still have that email which i will pass on to you,
I will not mention no names as yet in case I have got it wrong but the with the names whats bought up than your on the right track, This was including buying into snailmail,