Email validation checks if an address is properly formatted, the domain exists, and the mailbox is active and can receive messages. It happens before you send, protecting your sender reputation by filtering out bad addresses that would bounce.
Why It Matters
High bounce rates destroy sender reputation. ISPs see bounces as a sign of spam or list buying. Your emails land in junk folders or get blocked entirely. Validation prevents this. It also saves money on email marketing platforms that charge per contact. Why pay to store and send to dead addresses?
How It Works
- Syntax check: Verify the address follows proper format rules. Must have @ symbol, valid characters, proper domain structure.
- Domain verification: Confirm the domain exists and has valid MX records that accept mail. No MX records means no email delivery.
- SMTP verification: Connect to the mail server and check if the mailbox exists without sending an actual email. Some servers block this, others allow it.
- Catch-all detection: Identify domains that accept all addresses. These can't be fully validated since the server says everything is valid.
- Disposable email detection: Flag temporary email services like Guerrilla Mail or 10 Minute Mail. These addresses work but expire quickly.
Example
You import 20,000 contacts into your CRM. Before sending a campaign, you validate the list. Results: 1,200 invalid syntax, 800 non-existent domains, 2,400 inactive mailboxes, 500 disposable addresses. You remove all 4,900 bad addresses. Your campaign goes to 15,100 valid recipients. Bounce rate: 2% instead of 27%. Gmail and Outlook see your emails as legitimate, not spam. Deliverability stays high.
Related Terms
Learn More
- How to Validate Email Addresses in Salesforce
- How to Validate Email Addresses in HubSpot
- Data Validation Services
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