For me as a group leader i want to send a group MSG with more info in it 200 is way to low for that
can you like make it 400 ??
And there is a bug no one said anything about when you want to send a privet mail in game it tells you "sender not found" or something like that
For the 30 min wait i can understand that it's here so no one spam the mail but it can do with like a lower delay time between them like 15-20 might be good
last thing is there a chance to send a mail to multiple players in the same time not like the player in your group ?