UBB.threads PHP Forum Software Community Forums UBB.classic UBB.classic 6 Support Not sending registration email

HI, we recently realized that our board wasn't sending the registration email. The location of sendmail is correct. As far as I can figure, there is not an option somewhere that says "send" or "don't send" -- all email functions are enabled. Where else should I be looking to figure out why this is not going out?

Thanks!
Marianne