Say 'No' to bad email addresses
Email addresses enter systems from multiple entry points. Using an email validation API to check email addresses as they are entered will improve your data quality. The API can integrate in multiple places, like on sign-up forms, on your CRM etc. It can be installed by your developer to get full scope of all the functionality, or you can use an app plug-in service to use it in your processes. That's often something marketers can do without needing a developer to help. You can't build good communication on bad email addresses!