Add Address Verification Service
What: Consider adding an address checker to the website to help manage number of bad addresses (incorrect unit, missing zip code, etc). This tool could help us verify/correct postal addresses.
Why: Potentially important for decreasing amount of mail that is marked undeliverable and returned to the PC

This idea is moving to priority as we plan on testing out a new way to manage addresses within Salesforce to hopefully clean up addresses.
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KD Dase commented
Can I add to this if the email address can also be verified when the account is created or when the field gets updates. Typically, for trips and course activities it has not been a problem. Having said that I have seen spelling errors for them but only occasionally. I most often see emails bounce back when I have to send updates to the wider audience on our committee roster or student/instructor roster from past years.