Thanks to a comment on my last post about saying no to a bad postal bill, I learned from The Creative Beast about another wonderful little campaign called Send the Love. This one is more about good energy than politics, but gratitude is a powerful thing, and letting our postal workers know we appreciate them has to brighten their day. So this idea is all about "sending messages of support and gratitude for our postal workers during this time of crisis."
My favorite option is the "make a mark" suggestion:
Next time you put something in the mail, on the back of the envelope, make a mark of support to show postal workers that you value what they do. Just draw a simple heart with a P.O. inside. If you’re more creative, make a drawing or write a note. The postal workers who handle the mail, from the person who takes it out of the blue collection box to the people who do the sorting and processing to the person who puts it in your box — they will all get the message. So many postal workers make sure your mail gets where it’s going. Send them some thanks.