>Does greylisting increase chances of bulk detectors (razor/pyzor/dcc) in >case of "yahoo like" spam sources?
No. A remarkable fraction of ratware still doesn't bother to retry, so the most simple minded greylister will deter them. That's why it's useful. I've never seen any support for the theory that greylisting delays make it more likely that the host will be blacklisted when it retries. I haven't seen many legit senders that don't retry as David says he has, but I don't have his volume of mail, either.
