Why do I keep getting back email that I sent failure?

Its says that it was deemed spam and wasn't sent. How can I stop getting this email that's telling me this. Its annoying.

I hardly ever use my Yahoo email but for some reason I keep getting these emails marked MAILER-DAEMON failure notice. I scanned one of the emails and then opened it and it says one of my emails failed to send and it was going to some AOL email that I...

I keep getting "Mail Delivery (failure myemail@address)" messages in my webmail inbox/junk mail box for email I've never sent. What's going on? [details inside] The form the email takes is this: From: xxx@xxx.com.xx To: me@yahoo.com Subject...

I keep getting failure notices for messages i never sent with different names and my email address

For the past several weeks in my yahoo email acct. i consistently am getting email messages "mailer-daemon" failure to send message. The aggravating thing is i know the email addresses are in fact correct. i have emailed yahoo help center with...

Alright so, I sent this email to some one on hotmail and each time I do I get this 'delivery failure' notice say it couldn't send the message. On the failure notice it gives the time/date/ and who I sent it to. And then it gives an attachment on the...

I keep getting mail sent back that I have not sent. I do not know the people to which it is sent, and it is of a sexual nature. Somehow someone is using my email address to send this mail. What can I do?

I've been trying to send an email to a friend, but every time I send her an email, I receive an email saying that the person Im sending to doesn't have a yahoo account!!! How can that be?I sent an email few days ago, but now it says she doesn't have...