When i'm insert TAB character (by copying something from somewhere, or inserting by pressing Ctrl-I) I see it correctly (by some number of spaces) while edit, but after send I get some bad symbol instead of couple of spaces...
TAB is not multiple spaces, its one character (that causes cursor movement to a tabstop position), that doesnt translate nicely on recievers ends, it gets showed as one character, a small square on mine.