When I send a mail out to a group of friends I always get a return mail error message telling me that my mail cannot be sent o a certain *** Email address is removed for privacy ***. I do not know who he is, he is not in my Contacts list. When I check my group contact list, I do not see that name.

I have deleted the entire group contact and built a new one. The same thing happens.

Who is that mysterious guy? How is he hidden in my group contact list?

How can I delete him from my contact list so that I do not get a Mailer Daemon return message?

 Thank for helping me solve this mystery