Link for this information: http://www.wpaag.org/Add%20-%20legislators%20&%20%20instructions.htm

Sending Emails to Several Legislators At One Time

Instructions:  You can cut and paste the following e-mails into your address box and send them to all legislators in three emails -- or pick out your local legislators if you prefer. (The first section is Senator emails, 2nd section representatives)  Some providers only allow 50 addresses so if  you send to all you probably want to divide that way.  Be sure that no words other than the addresses are in the box.  If  you don't want the recipient to know the other people it was sent to,  type in one address in the address line and copy and paste the rest in the BCC line.  That is probably the best approach if you know how to do it.  If your BCC line doesn't show on the new e-mail you are sending and you are using Outlook Express, go to View on the toolbar and click All Headers and it will show up. In Yahoo go to compose and just above the TO line it will say "show BCC" 

 (For a list of names and addresses & phone numbers of all legislators for 2007 in list form, see this link: http://www.wpaag.org/AddressesArSenate.htm  (Some providers like Yahoo also require a comma between emails.)  They are listed that way below this first list (and are double spaced to keep them separate from the other ones. 

At the very end of the email is contact information for US legislators.