Yes and any color can be mailed.
Put the correct amount of postage stamp on the envelope, address the envelope and then post the envelope.
You write the address on the front of the envelope, in the order name - street and number - town/city - postcode - country, on different lines. You post it to wherever you want it to go; do this by addressing it then placing in a post collection box.
You can get a secure envelope for your passport at your local post office or a store that sells office supplies.
you have to put the post stamp on it and then it will say where its supposed to send to
It depends on which country you are in and how big your envelope is. The bigger the envelope the more stamps you have to put on. ( that's in the UK)
Old enough to address an envelope - there is no time limit.
If you want to send it in the post then a name, address and stamp are required
No. They charge by weight and/or size.
I went down to the post office to deliver my envolope.
Just write a letter and then put it in an envelope. After stamp it and walk to the post box and post it. SIMPLE!
It is not the size of the envelope that matters, it is the weight - it is probably best to have the package weighed at the Post Office to obtain the correct postage.