# compliance

- [What does GDPR require for email and SMS marketing?](/explained/compliance/what-does-gdpr-require-for-email-and-sms-marketing)
- [What is a data processing agreement (DPA) with a messaging provider?](/explained/compliance/what-is-a-data-processing-agreement)
- [What is CAN-SPAM, and what must every marketing email contain?](/explained/compliance/what-is-can-spam)
- [What is CASL, and what does it require in Canada?](/explained/compliance/what-is-casl)
- [What is CTIA, and what are its messaging principles?](/explained/compliance/what-are-the-ctia-messaging-principles)
- [What is data residency, and where is my message data stored?](/explained/compliance/what-is-data-residency)
- [What is express written consent?](/explained/compliance/what-is-express-written-consent)
- [What is the TCPA, and what does it require for SMS and calls?](/explained/compliance/what-is-tcpa)