There is no specific requirement. As long as the stamp is in the upper right of the envelop, the automatic sorting machines can handle it. If it is too far off, it will be kicked out and has to be sorted by hand.
A stamp should be placed on the upper right corner of the front side of an envelope. This positioning allows for easy identification by postal workers and ensures that the stamp is visible for postage validation. Make sure the surface is clean and dry for optimal adhesion.
When addressing a side flapped envelope the side flap should be to to the right - regardless as to whether the person is addressing the envelope is left or right handed. So the postage stamp is on the same side as the opening flap.
In proper postage etiquette, the postage stamps is supposed to be affixed to the upper right hand side of the front of the envelope. The address should be in the center of the envelope, and the return address in the upper left hand side.
Presuming the postage is of the correct amount, and the stamp is entirely on the front of the envelope (not 1/3 on the envelope and 2/3 over the top or side) it should not matter.
A stamp because it sits in the corner of the envelope and then it gets posted somewhere on the other side of the world!
Stamps are to affixed. Stamps are to be cancelled. The convenience could be the reason.
On envelopes with a flap end, the stamp should be placed on the upper right corner of the front side. This positioning ensures that it is easily visible for postal processing. The flap should be sealed down, and the stamp should not obstruct any addresses or other important information on the envelope.
up down side to side
Oh, dude, if you put a stamp in the wrong corner, like, nothing too crazy happens. The mail carrier might give you a side-eye for not following the rules, but your mail will still get delivered. It's not like they're gonna send your letter to the Bermuda Triangle or something.
I'm guessing your talking about the envelope first put the address you want to mail it to on the center of the front side then put a return address on the top left corner then put a stamp on the top right corner
Width.
== == Yes you should just in case the guest you are asking has moved and there is no known address. You should be doing all the work when sending out your Invitations so the return address should go on along WITH A STAMP!