Thanks, Lutpin.

You said:
It's the number of users you can send a single PM to.
For example, if you want to have a discussion with two other users, you would have 2 "PM recipients".
The maximum number prevents newbie accounts from writing spam/advertising PMs to 100s of other users in an attempt to circumvent their PM/Post time-limitations.

My Question:
So, if I understand correctly, this applies to a single PM being sent to many users at the same time, meaning if my llimit is 3 max PM recipients, I only send one PM to not more than 3 users simultaneously? But I can send PMs to as many users as I want, provided each single PM isn't being sent to more than 3? Or have I misunderstood you?

Thanks!