Gmail – Sort by emails in Gmail by subject line

As long as you don't need to parse the contents of the subject line, you can do this with If This Then That.

You'll need the Gmail and Google Drive channels. Specifically:

Trigger

Depending on how you're going to identify the incoming message, you'll use one of the following triggers:

• Any new email in inbox
• New email in inbox from
• New starred email in inbox
• New email in inbox labeled
• New email in inbox from search

"Subject" is one of the ingredients available, which you'll obviously need. There's other useful things, like "ReceivedAt".

Action

You'll want Add row to spreadsheet where you'll defined the name of the spreadsheet, what goes in the row, and the folder path in Google Drive where it's located.

There are several recipes already shared that might service. This recipe, for instance, saves a new row for every received message.

To label the currently open mail, press L and start typing the label. Matching labels will appear as you type, so you can just navigate to the one you want (using arrow keys) and press Enter.

To label AND archive the mail at the same time, press V instead of L and follow the same procedure.

In the mail list view, use J and K to move up and down the list (the tiny arrow to the left of each item will move), press X to select one or more mails and then use L or V to add labels.