I printed out printable postage for Thursday, not thinking it was a Holiday.  What should I do?  I can't make it to the P.O. so a zero meter strip is out (as if my P.O. would have any freakin' idea about that anyway, they'd never fix it, they'd just tell me I was out of luck, grrrr)  anyway, can I put it in my mailbox on WED?  Can I drop it in a Blue Box on WED?  Will  a 2lb, 2 book package go in a blue box?

ed to add :  OK-I guess I should have read the Help Center first  (bad TG, bad TG) I found this :

What is the significance of the postmark date on the Wrapper Settings page?  Does it matter what date I choose there?

• Yes, it is important to choose the date properly--you need to mail the book within 48 hours of that date.
• It is okay to mail it earlier than the date; your package may be returned to you if you mail it later than 48 hours after that date.

So I guess as long as I get it in a Blue Box or my mailbox within 48hrs of THUR I should be ok...

I can't understand why the mail date is critical on printable postage for First Class or Media Rate packages, unless the PO is tracking how long it takes a package to arrive, or go through a service center. And I can't believe they would care how long a first class or media rate package goes through the mail. But they do track how long 3 day Priority takes, as they have stats on the USPS website that say "95% of Priority packages make it to their destination in 3 days or less".

Chuck, your package may be returned to you if your date is incorrect.  Your day of mailing must be the day of pickup (or sooner in Meaghan's case.) 

Here is a link for a discussion on this topic. Scroll down to see Steve's reply concerning the legal issues. http://www.paperbackswap.com/forum/view_topic.php?t=74131&l=10&ls=0#r1477475

Hmm. If it fits in the blue box I would put it in tonight or tomorrow and it will get picked up on the first pick up for that box on Fri.  That shouldn't be a problem it's within the 48hrs.  Otherwise you might have to go in on Fri or Sat to get it marked.  They do this to keep track of postal delivery times. I use the printed postage and mail 10-15books a week.  I frequently put them in the box after the last pickup with that days date on it or even the next morning and not one has ever come back. 

Thanks everyone.  They went in the blue box today.  Hopefully it will work ok.