When sending a business email to multiple people how do I hide all their email addresses?

I want to respect my customers and their privacy
When sending a business email to multiple people how do I hide all their email addresses?
Add the recipient addresses to the B.C.C. field of the message





It means blind carbon copy





They will all get a copy of the e-mail, but no-one can see anyone elses e-mail address, except they can see yours as the sender.
Reply:I'm think that CC means courtesy copy- so everyone else can see who's being kept in the loop and BC means blind copy so you can't see who else it's been sent too.
Reply:Put them in the field where it says BCC