MAILER_DAEMON ?????

[Mr.T]

Ok, firstly, i'm not a techy IT type of person, so any help, please respond in very simple idiot proof terms !.
For a long time now i've been getting occasional emails from "[e-mail]", with the subject as "Failure notice". Somehow this seemed to connect to my contacts box and send everyone in it, similar or strange mails. I ended up deleting my entire contact-box, doing frequent full Norton system scans, and even deleting every contact directly after sending any mails to them. The problem seemed to go away.
It's now back with avengence, and over one evening recently I received over 250 emails from [e-mail], even though my contact-box was empty, and a recent full system scan had been done. Additionally, while running a full Norton system scan I clocked up over 60 similar mails while running the scan.
Obviously I'm getting pretty pi**ed-off with this, and have no idea what to do about it or how to get it stopped.
Any help would be much appreciated. Thanks

[Mr.T]

So, does this mean I need to change my email address, or is there a less painful way of getting around this ?.

[Mr.T]

barky, that sounds do'able, even for a non-techy like me, but i am a non-techy, so how would I do that ?. Thanks.

[Mr.T]

I'm veiwing my emails with internet browser, and there are no junk emails in my sent folder.