The Postman Always Something Something

So my mom sent me a letter, full of cutouts of newspaper articles, as is her wont.

Anyways, she didn't put enough postage on it (she had stuffed so many articles in there that I guess it weighed too much), so while I got the letter, I also got a bill from the postlady for 23 cents. Who ever heard of such a thing?

So two dimes and three pennies go in the mailbox. I guess it's like a collect call?