Honestly, I'm uncertain what's going on with the mail for you. Given that the forum is suggesting a limit has been reached, I would suggest that it is meant quite literally - you have posted so many times that your limit has been reached, for that given period of time. Likely a built in feature to prevent spamming.
If that is happening with the forums, the mailing issue could be happening for similar reasons.
But this is all just guess work. Pet would have to look into it, I believe, to provide certain answers.