Mailing Lists: How to hide Email Addresses in SeaMonkey

Hello I am using the Email program within Mozilla 1.7.13. And I just wanted to know how to create Undisclosed" Email List in SeaMonkey. While I am send any mail to group and people who compress mail a lost the Email Addresses are listed at the top of the Email and I also wanted to hide this list from others, so that I don’t want see other email address. Can anyone suggest on this issue and so that I can solve mine issue.

While sending just change value in the address bar to BCC from to. You should do this before entering list name and address filed. And I think now when you click on the to you will get the selection list.