Are there any restrictions against mailing plain paper postcard for address changes?
Our office is going to move and I was going to print out address change postcards to mail to our clients. Is there any reason not to use a simple square of bright paper (regular copy weight) instead of actual postcard, other than the durability factor?
I have seen plain paper flyers come through the mail, but they are normally folded and taped. Since most of our clients are local, I doubt the cards would get too terribly banged up--I just wanted to make sure these wouldn't be too lightweight to go through sorting machines or anything. Thanks!