The Google Gmail team has introduced a new shortcut "e.", which archives email. You might be thinking, "Doesn't shortcut key 'y' archive email too? Well the answer is yes, but there’s a difference:

Shortcut "y" archives when you are reading mail from your inbox, but it actually removes the label if you read email from your label view. This is because technically, "y" removes the conversation from the current view. In inbox it removes from inbox, and in label view it removes the label. So to archive in the true sense of the word (removing it from inbox view) in "label view," I had to click the "more actions" drop-down menu and actually hand-select "archive."

After enabling shortcuts in Settings, tapping "e" will now archive your message no matter what. No more unnecessary mouse movements for me, and hopefully for you.[Gmail Blog]

Google, Gmail, Shortcut, Archive, Email, Messages, Email Archiving, New Features