Players can mail items to each other from anywhere in the world, but to open it they must travel to the Postmaster's Office. Mailing items is a safe way to conduct trades, send important documents or items, and more!
You'll also need to visit the Postmaster's Office to claim Daily Rewards and set Bounties on other players!
To mail something to another player, do /mail (playername) and drop the items into the mail box. It will send once closed.
To open your mail, do /itemmail open (box number). To see your box number and who the mail is from, do /itemmail list
No, you can mail a player as much as you like, but remember to follow the server's rules!