I do not want the email addresses of everyone in your address book. And I'm sure that most of the people in your address book don't want mine either. So stop sending them to us.
Did you notice you were doing it? Probably not. And even if you did you probably didn't know how to avoid doing it or you wouldn't have done it in the first place.
So here's the deal. When you send an email out to more than one person by typing or copying the address into the "to:" field, everyone can see it. That means that if you've included all 150 people in your address book they all get to see each other's addresses. Ditto with the "cc:" field. And some people might not appreciate you sending their email address to total strangers (or ex-husbands). Also, if your list is very large it can be a drag to scroll past all those addresses to get to the actual message.
How to avoid this? Use the "bcc:" field instead of the "to:" field. Most young people aren't familiar with the origin of "bcc", but those of us who remember the days of carbon paper and typewriters know it was used in business letters. It meant "blind carbon copy" and let the author signal to his secretary to send a copy to one or more people without the original recipient being aware of it.
In an email, when you paste those addresses into the "bcc:" field everyone who receives your email will see only that you sent it, but not to whom.
So - put your own address in the "to:" field, leave the "cc:" field blank, and put all those other addresses in the "bcc:" field.
Much cleaner, and much appreciated by all your friends.