There should be red marking on the front of the envelope called a postmark, it should name the city & state of the mail processing center the letter was sent from. This is not necessarily where it was mailed from, just where it was processed.
Yes. Every letter mailed in the US needs a stamp.
The size of the letter and where it is being mailed from are important factors. If it is being mailed from California, the price would be very different from if it was being mailed from Japan.
First, it will reflect badly on the company if mailed. Second, you should re-type the letter.
A letter mailed from Virginia to Florida should not take more than 2 to 3 days to arrive. Most of the mail today is sent by truck from one place to another.
3 days
Mailed ... it's the past tense of the action verb, mail as in to 'mail a letter.'
The direct object in the sentence is "letter." It is the recipient of the action performed by the subject "Leo."
Half a week at most
First Class mail should arrive in three to five days.
Tempe, Arizona
W-2 forms are supposed to be mailed by the end of January. That doesn't mean that you will always have it by then but they should be mailed by then.