undelivered mail return to sender what is this

02. October 2013 · Write a comment · Categories: Hotmail, Outlook.com · Tags: ,
I have bounce messages sent saying `undelivered mail return to sender` every time I want to email. It has only recently started doing this. I have looked at your previous questions asked and you asked for the source of email. There is pages of mixed up looking codes the top line said this


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">


How do I stop this? please help
Kerry