I will put this into steps:
1. Obtain any kind of paper.
2. Select the paper in your pocket.
3. Select write letter.
4. Select who you would like to write a letter to.
5. Write letter.
6. Go to town hall.
7. Stand on the red mat.
8. Talk to pelly. [If it's night do the same thing even though there is a different pelican]
9. Select send letter.[Or send mail]
10. Your character will automatically give letter to pelly[or other pelican] and it will automatically be sent to the person[Or animal] you selected it to go to.
No, they can only mail you.
So... first, you write a letter. ( To whoever you want to send the furniture to) then, drag the furniture you want to mail onto the mail. Then you will see that the furniture is in with the mail. Now mail it, and done you are!
If you want to remove friends in Animal Crossing Lets Go To The City then just be unfriendly by not giving them things,not talking,not sending mail and then they will just move house. You will know that because they will send you mail saying good-bye.
Get a very high number of HRA points (something like 120,000) and they will send you the model in the mail.
Well kind of. If you send a mail to a resident, with a present in, with furniture, they will send you something from their house. This is good if you have Elvis, because he will send you 1 of his 2 thrones. Also, check the recycling after you have sent the mail. Usually there is something in there.
walk
You can't
You have to create a snowman with correct proportions and then Snowman will send you an attached piece of furniture in the mail.
Celebrate
First make sure it is winter and make a snowman and talk to it and the net day it will send you a gift in the mail.
you can buy one an animal can give you one in the mail
He is a pelican that delivers mail.