One of the greatest annoyances is when you receive an email that has been CC’d (carbon copied) to dozens of other people. Each of those dozens of other people now have access to your email address, which can be annoying if the revealed email address is a personal one that you only give to a few people.

What I think is the solution is for an email client to put a “Not recommended, use BCC (blind carbon copy)” right next to the CC textarea. There should also be a checkbox that appends the number of people that received the BCC’d email. That way, the sender can avoid annoyed recipients that thought they were the only one that received the email.

Of course, you do not need a new email client to achieve this. A Greasemonkey script, Firefox extension, or some type of plugin for any browser could be written to work on popular existing webmail clients like Gmail.

However, you do not even need to write code to accomplish this. Simply use BCC and tell people that they are not the only one that the message was sent to.