I have been emailing about 400 people regularly since early November. I've let them know that if they prefer not to receive my messages, I would be glad to remove their address. So far, I've had only two out of those request removal. KCBS doesn't say these kinds of emails can't be done by candidates. In fact, a few at KCBS receive my weekly message, athough they cannot voice support publicly for any candidate. KCBS will not give out an email list of members to anyone and they have no control over where addresses are gathered.
As for the BCC thing, except for my first email, I have used BCC... Until this morning. We were so busy getting ready for our New Years Day party that I forgot, got in a hurry and did not. I will always use BCC going forward.
KCBS Member #14287