Email validation

Email validation is the process of confirming whether an email address is syntactically correct, exists, and can receive messages – before attempting delivery. Validation is typically done in two contexts: 

• At the point of collection (e.g., signup forms) to catch typos, fakes, or disposable emails 
• As part of a re-engagement or hygiene strategy to identify risky or undeliverable addresses on older lists 

Though Mailgun’s validation API will return comprehensive feedback on each contact – not just confirming whether an email address is deliverable but also providing feedback on user engagement – it cannot tell you if the contact is still interested in receiving your marketing emails. Maintaining a healthy list requires permission-based acquisition, regular pruning of inactive subscribers, and strong engagement monitoring – not just validation tools.