mybiz announced a new email feature. Now you can use mybiz using any email account, or several email accounts if you have more than one. Whether you sell through an auction site, your own Web site, or other Web-based storefronts, you can use mybiz customer relationship tools. You can also send email from your mybiz account using your existing email account as the reply address.
http://www.mybiz.com/email/other_email.html