Windows 7: To my email account - to gMail account ?

I recently changed from gMail to a email client. Why is my email being sent to the email address I want it to, then immediately after to literally my gMail (<name>@gmail.com) account, is there any way to prevent this ?

Very confusing post...please explain in more detail, as specific as you can. What email client are you using?

You need to tell your contacts your new mail address.

The new client is Thunderbird. Updating my contacts won't solve the problem, because my contacts are already setup to use the default email address, not the gmail.com address. Yet gMail mails me a second copy of the message via gMail arrgh this is why I dumped gMail, if Google is good at anything it's "searching" period.

Can you take some screen shots of what your talking about or even better use video to show your exact problem. Do you just have one email address and that's with gmail? Do you have a ISP email account?

I do have one email address that is with gMail, but if email is sent to one address, it shouldn't be going though another address, in this case gMail as well.