I think it was right and proper for you to send it. It's HONEST, right? It's only "pursuing" if you continue to send him pleading e-mails. Knocking him over the head with ONE is laying out to him what your personal integrity is, and letting him know what you think of his unacceptable behavior. Say your peace once, and then drop it, LIVING OUT your faith in front of him on a daily basis.
Actions mean far more than words to an infidel anyway.
