What happens to 'postage due' Domestic mail?
Throughout its journey mail may be periodically checked to ensure it has proper postage. If a mail piece does not have proper postage, it may be returned or delivered according to the following scenarios:
If the item is without postage, or it appears postage fell off, it is endorsed "Returned for Postage Mail" and sent to the return address on the mailpiece.
If the item is short paid, it will be delivered postage due and the letter carrier will endorse it to show the amount of the postage due.
The recipient must pay in cash for postage due mail before the mail is delivered.
Depending on location, letter carriers may or may not be able to collect Postage Due directly from a customer or a customer's mailbox; for further information on how to pay for the Postage Due, please contact your Local Post Office facility.
Rural carriers are not required to go to the door with a postage due letter. Policy stipulates that rural carriers go only as far as the mailbox and blow the horn. The recipient must come out to the mailbox to pay and receive the letter.
Note: If the short paid item cannot be delivered as addressed (including if the recipient refuses to pay for and accept it), it is endorsed "Returned for Additional Postage" and sent to the return address on the mailpiece.
If an item is returned because of no postage or insufficient postage and one of the following is the case:
No return address is shown
The delivery and return addresses are identical
The delivery and return addresses are different, but for the same person or organization, then the mailpiece is treated as dead mail. Please see: What happens to a piece of mail when it cannot be delivered or returned to sender?
Note: A returned shortpaid mailpiece can have the necessary additional postage affixed (leaving the "postage due" message intact) to the original piece and does not have to be placed in a new envelope or wrapper.
This is directly from the USPS website. It seems we are all correct as to weather or not it will be delivered if you only have the .41 stamp and postage is due. It may or may not given the circumstances. Good luck if you didn't have the Forever stamp. I've generally found that I do not have very good luck with the USPS.
also-many buisnesses use p.o. boxes to receive their payments (even if a street address is listed-it's still actualy of p.o. box facility) and i don't think you can do postage due for those (since there's no one that can hold and process the receipting of the shortage).
