You are entering the the arena of spamwear - nobody pays for it (not even the spammers) so its bad, and ignores most of the mail protocol.
bcc means you write the message once and nobody knows whom else you sent it to. Its easy.
Email + Marketing = dont mix. Im now on a CD of email names. some retard executive person will think because im on a cd rom I want there special messages. I don't opt out of stuff I never wanted.