When sending an email out to your house list, don’t make this mistake.
This method probably shaved a few hours off the sending process but broadcasting email addresses of your list members to the public just makes you want to scream “unsubscribe” (an option which they left out).
This reminds me of the time when the Nokia Elite team emailed an event invitation to everyone on their list using the same ’send to all’ method. Marketers would have killed to get their hands on that email — you wouldn’t believe the names that were on that list.