There are several places where you can play draughts on-line ( in the real-time and by e-mail )
We put here just few links with the short description.
If you know more - please advise

Real-time


KNDB damserver
(100, Brazilian, 144)


PlayOK (Poland)
(100, Brazilian)


VOG
Different versions


Microsoft Game Zone
(Checkers)


Yahoo
(Checkers)


I-damas
(100, Brazilian)

On site


AShShI (Russia)
Different


Ludoteka (Spain)
Different


E-dama
100


Play Arena
Different versions