Contacts with multiple addresses


New Email
I am using Yahoo Mail (have been for many years). I am now getting a little more sophisticated and am using contact groups more often and therein lies my problem. I have many contacts that each have multiple e-mail addresses. I want to send an e-mail to those contacts to each of their addresses. I have placed the different addresses in the contacts' profile under different categories such as "work", "home", etc. What I need to know is if, when I pick this contact and put his/her name in the "To" line, my e-mail will go to all of his/her addresses or to only the primary address. Having a single e-mail go to multiple addresses for a single contact is extremely important to what I do. If Yahoo can not support this, then I need to know of an e-mail program that can support this. Thank you for any help you can provide.