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All unused U.S. postage stamps
issued since 1861 are still valid as postage at their indicated value.
Stamps with no value shown or denominated by a letter are also still
valid at their purchase price.
The cost of mailing a letter increased on May 14, 2007 to 41
cents, but the Post Office now offers a "forever" stamp. This stamp will
be sold at the standard rate, but will always be valid for 1st class
mail, no matter how rates rise in the future.
Copyright and reproduction
All U.S. postage stamps and other postage items that were released
before 1978 are in the public domain. The postal service holds copyright
to such materials released after 1978 under Title 17 of the United
States Code. Written permission is required for use of copyrighted
postage stamp images.
PC postage
In addition to using standard stamps, postage can now be printed from a
personal computer using a system called Information Based Indicia.
Authorized providers of PC Postage are:
Stamps.com
Pitney Bowes
Endicia Internet Postage
eBay
Click-N-Ship
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