Just press reply from gmail or whatever email provider you are using, and it will reply back to the member's own email address.
If you look at headers from these messages you'll see the reply-to email address with the buyers email address.
Yes, it's a crap shoot if it reaches the person. Some do not answer the email, or skip over it. I get through about 75%-80% of the time.
If that doesn't work, login to eBay and send your message.
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