But weird. Under 'TO' i added user1@mail.com.
Under BCC, I added user2 and user3 etc. But user2 and user3 will see 'TO' user1@mail.com and not their own address.This is how it works right?

That's means i can TO 'newsletter@site.com' and BCC all my members? So every one will see 'newsletter@site.com. am i correct?