How do I change my default email address?

When in IM and send a reg email, it defaults to my private, nonYahoo email acct. I want to change that so default to my Yahoo email acct. if possible. thanks

I originally registered my previous email with you, tmingledorff@charter.net. I am phasing out of that email address. My new email address is tmingledorff@gmail.com

I have a Macbook Pro with Tiger. I'm trying to change my Administrative email address so that iCal will send my notifications to an email address that I actually check. Thanks for the help. :-)

I do not like using outlook express to send Emails so how do I set it so that when I click a Email link my Yahoo account comes up ?

My default address in my Yahoo calendar is from a long gone Netcom account. On the Yahoo Calendar app I don't see any means to alter the email addresses used for notification, but I assume there must be a way to do this. Thanks.

It reflects my real name when I don't want it to, but seems to carry my screen name when email to different people other than yahoo. Yahoo recipient see my real name where as when I mail to AOL it only show my screen name. I don't want it to show my...

I'm pretty sure I can change my email address. But does anyone know a way that you can do it, even if it has to be done manually, that won't delete all of my emails that I have? I like everything about my email except the fact that I just made it to...

I can't work out how to change this.  At present, on all my groups, if a group member sends an email to the group, and someone wants to reply to the whole group, if they hit reply, they just send it to the sender of the email, not the whole group. To...