Hi Kids: I am not a postal worker although I deal with postal problems nearly every day. I believe the first problem is that most mail is read by an automated optical reader/scanner. Since many post cards contain handwriting, I should think the scanner would have a more difficult time reading the address, if it can read them at all... and the Post office may not bar code the item. Thus making the entire trip manual and subject to every possible human error. Last week it took 7 days for a letter to go from Portland Maine to Burlington Vermont - it usually arrives over night. The bar code on the bottom of the envelope had been incorrected coded and it went on an oddessy - to parts unknown, finally arriving one week later. Go figure.