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yes
Ink jet cartridges would be better to send on metered mail. They are more compact and the cases contain less plastic that would contribute to weight.
US postage is used to send mail from the US to any other country.
Send, ship, deliver, post
Yes.
franking .
yes, but not in a regular envelope or for regular postage
franking priviledge
Franking
The entire purpose of the Forever Stamps was that you can use them for one ounce of First Class Postage forever. No additional postage is necessary.
Not if you touch it.
current postage stamp rate is $0.42