Gmail Power Trick: Send & Archive
If your Gmail inbox contains a long list of emails that you’ve already replied to (and by default they’ll stay in your inbox even after you’ve replied), here’s a tip that allows you to reply and archive an email at the same time. So when you reply to someone, their email is moved from the inbox to the “all mail” folder as soon as you hit the “Send & Archive” button.
So how do you get the “Send & Archive button”? Easy!
Open Gmail, and click on the gear icons near the top right. Choose “Settings”.
Under the “General” tab, next to “Send and Archive” tick the box next to “Show ‘Send & archive button in reply”.
Scroll all the way down to the bottom of the page and click “Save changes”.
Now when you reply to an email using the Send & Archive button, the mail you replied to is moved out of your inbox and archived in the “All Mail” folder, making for a much neater inbox. And you still have a copy of the mail in your Sent folder and the All Mail folder.