ROL - do you have mulitple accounts in gmail? For example, I have an e-mail address from our internet provider, say att.net, that I forward to my gmail account. I think I just figured it out after researching. So this is a a few years late and I am sure ROL figured it out by now, or has just got used to it, or gone insane! :) But, I ran across this same problem as ROL, all my sent e-mails, replies, etc were showing in my inbox and it was driving me insane! It had not done this before when I first set up my gmail account. To delete this filter go to the Filters and Blocked Addresses tab of your Gmail settings and delete the filter that says something like 'Matches: Do this: Star it. If you find that you want some starred emails to appear in your Primary inbox but not the ones sent by you then like me you may have set up a filter to automatically star your outgoing emails. This means that no emails marked with a star will appear in your Primary inbox. Now click on the tab Inbox and untick the box 'include starred in Primary'. Click the drop down menu alongside the cog symbol to the right of your screen and click on Settings. Go to your webmail interface and log in. However in my Gmail settings the box had become ticked which says 'include starred in Primary inbox' which explains why I started receiving a copy of all my newly-sent and subsequently starred messages in my inbox. In my Gmail webmail interface I had elected to make all emails sent by me to be marked with a star. I have now managed to resolve this problem.

Send all my mail to inbox gmail