I prepare shipments at all hours, and any order that is received after the mail pickup is prepared and postdated, often in the evening, for the next day. The emails for these shipments are being sent 24 hours later...the next evening...which is after the packages have already shipped. By this time, I have often already notified the customer that their package is on the way, so it's embarrassing for me to have them then receive another email that says that the package has been "prepared for shipment".
Why can't all these emails go out first thing in the morning? That would totally avoid this problem (which I never had with Stamps.com).