# Features ### [How does the USPS validate address information?](https://bigmail.io/blog/how-does-the-usps-validate-address-information/) There’s nothing worse than investing in a direct mail campaign and having your mail returned for various reasons, which can sometimes go unexplained. We are… October 1, 2021 ### [Use Merge Tags in your Direct Mail](https://bigmail.io/blog/use-merge-tags-in-your-direct-mail/) , don’t write your cards by hand. That was intentional. Merge tags allow you to customize your mailers. Add to your campaign and the… October 31, 2019