Address management is steaming pile of compost
Snapfish has got to have one of the most horrific user experiences for mailing cards and the like. It has a csv import function for addresses but has a ton of cryptic formatting rules and is completely useless at telling you what’s wrong. Just “something is wrong with your csv” no specific error, no row or column, no way to figure out the problem. It’s as if they lose money by mailing for you and don’t want customer to actually do that.