From the article >"Everyone is unique, so you should make sure each individual mailpiece is customized as much as possible. Don't be afraid to use customer data

From the article >"Everyone is unique, so you should make sure each individual mailpiece is customized as much as possible. Don't be afraid to use customer data to personalize and make a statement with your mailing." "Dont be afraid to use customer data" seems like a dangerous general recommendation to make for an article recommending using the API to send postcards that are open to the world to read. Now I can't just discard spam mail adressed to "Resident", I'll have to read it all and make sure to shred it in case it has some sensitive data automatically encoded into the postcard?