Weird mail

It’s very unusual for us to not to get mail every day except for Sunday. My husband has been bothered by it because it’s just so weird. Someday it’s like the mail box are overflowing with all kinds of mails, including the junk mails then other day it’s zero mail. My husband is suspecting that maybe they are keeping our mails which I’m not sure if his instinct is right or wrong. I have no idea why this is happening now. All I care is that I will receive all the important mails that should come to our mailbox.