This is how to change the email address that Yahoo uses to send you emails for all your groups.

Go to the Yahoo web page for any of your lists (you may have to log on using your Yahoo ID and Yahoo password). If you've never been to the Yahoo web page for a list or don't have it bookmarked, you can just go to http://groups.yahoo.com

Click on "My Account" (this is a small link at the top of the page)

Under Member Information - click the Edit link
There is a place to add alternate email addresses. Add the one you want to use. Be sure to click the Finished button when you're done. Yahoo will send an email to that address to verify it and you will have to follow the instructions in that email.

After you have added this address and it's been verified, go to http://groups.yahoo.com or to one of your group pages, and click My Groups. You will see a list of all your groups.

Click the Edit Groups link

For each of your groups, to the right of the email address there is a drop down menu for email address. The new address should show up in the menu and you need to choose it for each group (it probably won't show up until you have verified it by responding to the email Yahoo sends you. If it still doesn't show up, close down all your browsers and then open a new browser and go back to the Yahoo Groups page and try this again).

Change each email address to the one you want for the group and when you're done, click Save Changes.

There are several ways to do all this and I've just given you what I think is the fastest way. You may find that as you go into Yahoo and poke around, you'll get the hang of this kind of change and do it some other way.

Hope that helps,
Kitty