Here is a trick that I invented and advocate:
Use a dummy email address. I use
[email protected]
Put the dummy email address in the "Send to" field.
Put ALL YOUR OTHER recipients in the BCC (blind carbon copy) field.
This works whether you are FORWARDING an email or even COMPOSING A NEW email. What the recipient gets is an email that shows his/her name only, and the dummy email address.
In addition, when you FORWARD an email, be sure to DELETE in the *BODY* of the email:
1. Anybody else's email address.
2. Any contact information from any previous sender (phone numbers, addresses, etc).
3. Any sensitive information that should not be read by other people (such as personal comments or gossip).
4. Any automatic add-ons from sender's providers (for example, the "get free smileys here" or AVAST messages, etc that are usually found at the bottom of emails.
Remember, not only are you protecting your friends from unintended disclosure of their contact information, but you are doing your part to rid the internet of spam, and you are also preventing it from slowing down. The more information that you send, the more bandwidth that is used up. Keep your emails as small as possible by cutting out the "fat".