Have you tried to reply to a question from a potential buyer, and your email has the bogus address of UseTheYellowButton@eBay.com? This means your customer has hidden their email address, and you have to open "My Messages" to respond to their question.  Many sellers don't like to have to rely on eBay to reply to their messages.
 
eBay has developed a new system that will protect the buyer's anonymity, but also allow the seller to use their own email client to respond.  Here are the details:
 
Hi, I'm Sonia Wong with eBay's Product Management team. We've been working on a way for you to respond to emails sent to you through eBay's systems (such as Ask Seller A Question) from your own email client, while still protecting the privacy of email addresses.

Currently, when an email is sent to you through eBay's system -- and the sender has chosen to hide their email address -- you cannot respond directly from your email client. Instead, you are directed to "Use The Yellow Button" within the body of the email, which takes you to a Reply form within My Messages.

We've heard from members that this can be confusing and inefficient, especially when you have a large volume of emails to answer.

To make responding to your eBay email easier, we've developed Anonymous Email Forwarding. This change will allow you to respond to email from your own email client, while still protecting the sender's privacy. This feature will launch near the end of the month.

Here's how Anonymous Email Forwarding works:
When a member sends you a message through eBay and has chosen to hide their email address, we'll create anonymous email addresses for both you and the sender. You can then reply to emails directly from your email client just like you do for any email. When your response comes back into our systems, our system will forward it to the appropriate recipient.

The anonymous email forwarding service will help members communicate easily with one another while preserving the privacy of your email addresses.

Of course, you can still use My Messages to respond, if you prefer.

For more details about Anonymous Email Forwarding, please see our information page.
http://pages.ebay.com/help/confidence/anonymous-email-forwarding.html?ssPageName=CMDV:AB

Sincerely,

Sonia Wong
Director, Product Management