Can you be more specific?
What are you expecting that the mail carrier isn't delivering? Reward certificates, smelted metal, cut gems, omni plant seeds, bills? When do you check the mail, I believe they deliver around 8am...? If you're expecting bills, you do not have the No Bills Ever LTR, correct? If your sim has the Good trait, can you still donate to charity?
Newspaper - you didn't cancel the service, right? If not, the paper isn't being delivered somewhere that it blends into the ground (I used to have a pale grey/white flagstone walkway, and the paper against it made it a challenge to locate). Or is it that you're trying to get it late enough that maybe a stray animal has destroyed it first?