The Change A Letter Game!

[Ænima]

Change a letter of the word posted by the user above you, but keep it a real word.
But, Underline and make the letter that you changed red.

(The word must be four letters long.)

First Word: Mail

[Worldking01]

Mall. This is a fun game.

Mall.

[Monotony]

Call.I call this called game a fun game that deserves to be called call.
Was this uncalled for?

[Snookie]

Call.I call this called game a fun game that deserves to be called call.
Was this uncalled for?

Hall, This is a game you so copied of MCCP.

[Samwesty999]

Hall, This is a game you so copied of MCCP.

Hell

(A place where very bad people go)

[Cammayyistammika]

Help. :P

That's what I need now.