We've been struggling for a a few weeks with all messages sent via a google apps account also appearing on its own inbox (as already read) as well as the correct "sent" folder/label. We tested it from different imap connections and reviewed all configs without success.
migrated from superuser.com Apr 11 at 20:20
This question came from our site for computer enthusiasts and power users.
Finally figured out via a few comments on forum it had to be filter related. As this is a heavy filtered account it took us a while and the answer was a simple rule to avoid mails from our own domains being classified as spam.
In Gmail filters an action of "never classify as spam" apparently also applies to sent messages and automatically assumes unless you specify another it will put it in the inbox.
So once we removed a rule of type:
The problem was solved
I have also had the problem of a copy of my Gmail sent mail showing up in my Inbox. I put in filters, I checked one Gmail account against another where this was not happening. Today I figured it out. Go to Gmail - Settings - Forwarding POP/IMAP - POP Download. Find the question "when messages are accessed from POP (options). Mine had (keep Gmails copy in Inbox). It is a drop down box so you have options. I used (delete Gmail copy). I am still getting a copy in Sent mail. I hope this helps someone avoid the frustration I have had solving this issue.