For those who use auctiva for shipping labels. Auctiva has NOT updated to the new rates as of this morning at 9:42 a.m. eastern time. Guy at our post office said they have been told to start returning packages with insufficient postage immediately.
I know some people who work, may print on Sunday night for Monday mailings. Sooo you may want to try later today as they could be updating today so they are ready for Monday.
I just know it is irritating to have package returned and buyer irritated because it was not delivered when they thought it would be. Even more irritating to a buyer to have to go stand in line at post office to pay insufficient postage for their item. (been there done that, and it is irritating to wait and then pay what seller should have paid).