Square greeting cards

Has anyone mailed square greeting cards (which seem to be the norm here) back to the US?  Have there been any problems?  Did you need to pay more postage?

I know within the US it costs a bit more to send the square ones because they require handling by a person as opposed to their machinery.  I'm not sure this is still applicable, but it was about 8 years ago or whenever I last lived there.    I've always tried to send rectangular ones but all the cute ones are square so I'd like to make a change.

Thanks!

No problems at all. I send a combination of square and rectangular cards and, honestly, have never given it a second thought.

No problems at all. I send a combination of square and rectangular cards and, honestly, have never given it a second thought.

Ditto.