E-mail.... To myself?

So, I got a spam E-mail talking about Men's health.
Nothing new there.

Strange thing though, I got it from myself...
Now, I'm pretty sure an E-mail address is like Angelina Jolie's body - there is only one of them.

So, I replied to the spam message (Like usual) saying, "Fuck you."
Scarier.

I got the message, in my Bulk, I slowly opened the E-mail and got the message, "Fuck you."
So after fucking myself, I checked my sent box, and the Spam e-mail was in there.

So my question, does some Evil Spam King have my E-mail password, or is there some type of Evil Spam software that can mimic my password?

Short of a massive post, it's possible to forge headers in an email to make it appear like it's been sent from any address on the planet.

I get quite a few spam messages apparently from some of my own email addresses, which is bullshit since I never use them to send anything.

If you replied to a spam message forged to look like it was from yourself, you will get the reply =o. A reply from you isn't important, they want you to click a link or load an image embedded in the message (so they know your address is active).

Ah, I see. Those bastards, good thing I didn't click the link, yeah?
I'll delete it.

Thanks, I feel secure once again! 
*Cheers*