[apiontek]

For anybody else who's wondering, I figured it out. This is what worked for me:

1. click Preferences
2. click Metadata plugboards under import/export
3. next to "Add new plugboard"
   1. select "any format" under Format
   2. select "email" under Device
   3. copy and paste the following into the "source template" box:

      {tags:'contains($, 'News', field('date'), field('authors'))'}

   4. select "authors" under Destination field
4. click Save plugboard
5. click Close on the Preferences window

With that, anything I send to my Kindle Touch by emailing my @kindle.com address that has "News" amongst its tags gets a "Date" as the author, while other items still have the author.