The phrase "mail postcards" means sending small, picture-filled cards through the postal service to friends or family as a way of communicating or sharing your experiences. Full definition
One way to stand out from the competition: Platinum Image personalized direct mail postcards with four - color designs on both sides. (realtormag.realtor.org)
They're providing me with two different sets of bulk mail postcards every month, one for my sphere of influence and one for my farming area, just over 500 in all. (realtormag.realtor.org)
Which might not sound so bad, until you look at how many direct mail postcards you should be sending out to reach your target audience. (leadpropeller.com)