Hi Brad,
I think I read this somewhere ages ago, but I am not sure. Perhaps Erica can confirm. Initially (new members) have a limit to the number of messages in the mailbox. After a certain number of posts that limit is automatically removed. I think it's 50 or a 100 posts. (Because, I am not seeing that message in "My Messages")
I vaguely recall reading this ages ago.
Also, please don't suggest any "payment" options on here. Erica has a very very bad habit of going ahead and paying for all the mods herself and refuses to accept anything in return.
Despite numerous offers by all of us, she WILL NOT agree to contributions.
I think we need to hold some form of Intervention Therapy for her to get her to accept help