I sent an email to GoDaddy customer service a little while ago regarding these kind of emails (emails which have a manipulated "Reply To:" field so as to hide their actual source) ...
this is the reply ...
"
Thank you for contacting customer support.
It appears that you may have been "Joe Jobbed".
A Joe job is an e-mail spoofing exploit in which someone sends out huge volumes of spam that appear to be from someone other than the actual source. A Joe job is sometimes conducted as an act of revenge on someone who reports a spammer to their Internet service provider (ISP) or publicly advocates anti-spam legislation. The perpetrator is said to be Joeing the legitimate owner of the e-mail address they use. The Joe job is one of the oldest spamming operations in existence, and one of the simplest ones to carry out: the spammer may not have to do anything more than change the "Reply To" address in their e-mail program.
The term originated from an attack on Joe Doll, proprietor of Joe's CyberPost (joes.com).
Spammers often will use a random address from their spam list as the from address in their outgoing spam. This is done simply to disguise the true source. It's easy to become the victim of a Joe job, even if you are not an anti-spam advocate!
Everybody is at risk of being "Joe Jobbed".
So how can you protect yourself and your email account?
Don't unsubscribe from anything. That lets spammers know they have a valid email address. Keep your email address off websites!
Now that you have been a victim, you may not have any recourse to remedy the problem, if it is still persisting, except to change your email address. This is a discouraging answer, I am sure. The best protection is prevention.
Please let us know if we can help you in any other way.
Sincerely,
Mason G.
"