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This is what I see when I tried to reply to a message:
The following errors occurred with your submission
You have reached your stored private message quota and cannot send any further messages until space has been created.
Deleting messages didn't seem to help! :(
Try deleting those both in your inbox and those you sent. That may help. You have to delete a few of them to get it to work.
You can have up to 500 stored messages. Have you cleared some of your old ones out? It does save both sent and received by default. Just PM me if you still have the issue after you clear some out.