The PM system only stores 50 messages - does the system automatically drop the oldest messages, or does it start bouncing incoming ones, or something else?
The vBulletin version that I’m familiar with on other message boards bounces incoming messages. It tells the sender that your PM box is full, and sends an email to the address you have linked to your account saying something like:
‘DoperX tried to send you a private message but your PM box is full. To delete messages, click (followed by link that will take you to your PM box’.
My WAG is that the same thing will happen here.
Yes the mail protocols bounce you back a “full mailbox” message. Although some systems must automatically resend them because I received a string of messages over several days on one of my email accounts when someone on a long recipient list had a full box.