Contact Us

Questions, corrections to a USPS rule, a bug, or a feature request — we'd like to hear it.

Email us at

hello@directmailvalidator.com

We read every message and typically reply within a few business days. If you're reporting an incorrect result, please include the exact dimensions you entered so we can reproduce it.

Spotted an outdated USPS figure? Email us the official Notice 123 / DMM reference and we'll correct it quickly.