The wonder mail is where you enter the code of a job that you don't have or want. If you don't know what the code is, just check on of the jobs from the job bulletin board. They all have a code.
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I don't know how to get it I think its by wondermail
Yes, but only in Pokemon Mystery Dungeon: Explorers of Sky.
A dungeon is a cave on pokemon mystery dungeon. It is a level with a series of floors/rooms and the object is to get to the end of the dungeon.
go to http://pokemon-mystery-dungeon-explorers-of-light.webs.com
in the start menu, there is a wonder mail option. That's were you type in the wondermail code.