I'm making my own invitations. I was planning to make them A7 size (approx 3x4), which I think is cute. But when I checked USPS rules, it says you can't mail things smaller than 3x5. Is that true? Is there no way to mail cards smaller than that? Will they just refuse to let me send it?
I was planning to go shopping for paper tomorrow, and had my dimensions and quantities all worked out based on the A7 size. Now I'm afraid I'll have to rework everything...