I believe Sin has sorted out the rmail issue ^^ As for the other rmails you've sent and haven't been opened, it's possible that the users just haven't been online to open them, or missed the alert.
As for the egg hatches, it's possible you may have double clicked and caused 2 eggs to hatch at the same time, and the first one may have failed without you noticing. Do you happen to know what day this was?