Sign up for USPS Informed Delivery to preview your mail
Added
Create or use a USPS.com account, verify your identity, and opt in to Informed Delivery. You get a daily email with scans of letter mail arriving soon and can track packages, so you notice if an expected check, card or bill never shows up. Turn on multifactor authentication for the account.
The result
Result: USPS: the service is free; most residential addresses are eligible, and notifications typically start within 3 business days of signing up.
Source
USPS: Informed Delivery (opens the original source in a new tab). Check it for the latest numbers before you act.