When an address is entered, it would be nice if it synced up with the USPS for verification. If it cannot be done live, if there is the ability to push an unverified address through a job to verify against the USPS, and then populate an alert or go into a queue to be updated with what the post office recommends the address should b,e or if the address is not found at all.
This will help in verifying accurate addresses to reduce returned mail.