Learn something regularly. Stay on a schedule with a new fact each day or week. Have fun learning. Amaze your co-workers with daily facts you've learned. Find the email that matches your specific area of interest.
Some emails contain only a few sentences.
These facts are easier to commit to memory. Other emails may require you to look through several pages on your browser. You may want to save more complicated facts. Shorter facts like vocabulary words are better suited to be delivered daily. More complex facts can be delivered on a weekly schedule.