sent mail (USPS) with no return address, and stamp, what will happen to it?

Is there some special reason why you don't call the post office and ask?

When I am sent a bill, often times it says on the envelope where the stamp is supposed to be "The Post Office will not deliver without a stamp." So my guess is that it will go into the "dead letter" file where it will eventually be destroyed.

It's a myth that it's automatically delivered. The automatic sorter sometimes misses the lack of stamp and sends it out, but it's no longer policy to deliver with postage due.

It will be delivered and the person/company who it is going to will have to pay the postage costs. If they decline it the letter will go to the "dead letter office" where it will most likely end up in a big bin till it get shredded in a few years.

you need to get charged with attempting to forge the U. S. government out of their appropriate dues. next time think of a splash earlier you basically "toss some thing into the mailbox". you be responsive to the usps human beings artwork quite difficult! dont you think of they need to be paid?

How many more times do you plan on asking this?

It will go to the dead letter office.

it goes into civic category as it is not a politics question.