<What e-mail do you use?? An e-mail client on your PC or do you use Web-Mail???>

Sorry, I'm so ignorant that I don't know what this means.

If you were using your web browser to do email, that would decrease (but not eliminate) the chance that the problem is created by malware on your computer.

But it has other disadvantages.

I use Microsoft Outlook on my computer and a paid ISP that handles my e-mail (not a free e-mail like Yahoo).

Basically, there are three ways that this problem could be happening. They take different approaches.

1) There's malware on your computer doing it. Clean your computer.

2) Someone has hacked your account at your email provider. Change your password, before they do.

3) Someone is forging email headers to make things look like they come from you. Sadly, the closest thing to a solution here is to change your email address and ask your friends to auto-delete everything they receive from the old address. But that is a big bother. The good news is that addresses used for this purpose "age" and there should be a decreasing volume over time unless the forger happens to swipe the same address pairing again.

(How do they swipe them? Mostly, for pairings like this, from emails that get repeatedly forwarded to large groups of people - PLEASE never do that, if you absolutely must then at least use the "bcc" option. Or from any other place they can find that shows people's email addresses and connections to other people.)

(Really, I wish the people who make email software would make "bcc" the default. Or at a bare minimum create a setting permitting the user to make it the default.)