MBOX Viewer

In a post early in 2018 (https://dailyposts.paulishing.com/2018/02/download-your-google-data.html) I showed how you can download your data from Google.  For email, it gets exported into a single "MBOX" file which can be accessed using the free (I love free) "MBOX Viewer" by Systools.  In the example below, I started by searching my Gmail for "Travel Gnome" (a topic for another day), selected them all and applied a label to all of them.  I then had Google export just the email with that label, downloaded the "MBOX" File and brought it up in MBOX Viewer to get the screenshot below.

http://www.mboxviewer.com