Places to swap letters, postcards, and mail art
Postcrossing – send & receive postcards around the world. My Profile
Swap-bot – Swap mail, letters, and other things. My Profile
International Union of Mail-Artists – Exchange mail art with other mail artists. My Profile
Other places to write
Operation Gratitude – Write letters to active military service members, veterans, first responders, and others.
A Million Thanks – Write letters to military service members & veterans
Love for the Elderly – Write letters to older folks who could use some sunshine.
Other letter writing topics
Postcardy – Large list of postcard resources
National Postcard Week – Annual Event in March where participants design, print, and send postcards.
International Postcard Week – Annual Event in October where participants design, print, and send postcards.
OldPostcards.com – Online store featuring vintage postcards