First off: Welcome to the Forums . Second: Is TestingCheats in the console version? If it is, then simply turn it on, and then use 'reset sim [firstname] [lastname]'
No it's not.
@jswan
Are you sure you did what Crashhat69 told you to do?
Hover over the mail box and hold L2 then press X? It should say Reset Sim then give you names of ALL the sims in town.
If you have cheats on, from I can remember, that option should still be available except now there are other options as well. Like Mood boosts and such.
Take a picture of your mailbox options and upload it to an image host so we can see what kind of options your getting.