I have a buyer who keeps sending me emails demanding that I contact.  I have several times.  I do not get a message that emails are undeliverable.  I have tried through my hotmail, a different server and ebay.  I think she is getting the emails.  Can I ask ebay to try or do I have to call Atlanta?  The only contact information is her phone number - an address would be nice, I could send a registered letter.  How can I avoid getting a negative?