How do you turn off gmail's automatic cc'ing yourself on letters sent?

I’m not sure how you turn it off (not an iphone user) but you could create a filter that auto deletes mail sent from you. Or if you routinely send mail to yourself (file sharing stuff) could create a label and send all mail from you into that label then go through and delete the ones from the iphone.

To do the filter, go to settings then filters.

You need to turn “Recent Mode” off.

[On your iPhone] tap Settings > Mail > Your Gmail account name > Advanced, and turn off “Use Recent Mode.”

*Note: When you turn this off, unread messages older than 30 days will pop up in your inbox.

Hope this helps.