A letter from on person to another, not a business letter.
covetous person (greedy person)
Glutton
miser
glutton scrooge like miser cheapskate
The best way to sign a letter for another person is 'on behalf of'.
mutton
mutton
Selfish
A greedy person should have at least 31 advent calenders. 1 for each day!
Another for a black person
A miser.