Thanks for the reminder!

As a nifty fact, a  $0.03 stamp issued in 1851 would cost about $0.74 in today's dollars! So no complaining about the rates :)

I always thought that the post office gave a day or 2 "grace period" when rates go up- meaning if they open the blue box on monday and the letters all have $.42 stamps, thet will get where they need to go anyway.  Truth or Urban legend- I am not sure.

No real grace period. Not sure quite how they do it, but if it is metered for let's say May 10th, then no problem. If it has stamps and they believe it was posted the day or night of May 10th, then again, no problem.
If it has no postmark and they believe it was posted after midnight on May 11th then it will be sent postage due, or sometimes returned for more postage.

I suspect they just call the first early AM pickup the before midnight mail and let it go, but I do not KNOW this.

Thanks for the reminder!!!

So, if I printed off a wrapper and drop it in the box tomorrow it should be okay... right? 

The grocery store sells stamps, if I buy Forever Stamps on Sunday (5/10) will they still be 42¢ each?   ($8.40 a sheet? a book?) 

I always thought that the post office gave a day or 2 "grace period" when rates go up- meaning if they open the blue box on monday and the letters all have $.42 stamps, thet will get where they need to go anyway.  Truth or Urban legend- I am not sure.

I was told anything that is in the boxes today is okay but as of first thing tomorrow, the new rate will go into effect, so no grace period.