You can mail square cards. I do always place an additional .17 cent stamp to cover cost of oversized cards. If you did this in a 4 X 4 size, it would fit into a standard A2 envelope. I always keep A2 envelopes and 5.5" square envelopes on hand, as these are the two sizes I make most.
Originally Posted by MarcyD
I love the look of this card. How can it be mailed since it's square? I've got 80 Christmas cards that can't be hand delivered!