Email Verification Best Practices: How to Keep Your List Clean
Learn why email verification is critical for deliverability, how SMTP verification works, and how to clean your email list with LeadStonk.
The Devastating Impact of High Bounce Rates
Email service providers (ESPs) like Google and Microsoft monitor your bounce rate. The industry acceptable bounce rate is below 2%. If you regularly exceed this, ESPs will flag your domain as a spammer. Once your domain reputation is ruined, even your emails to valid addresses will end up in the spam folder.
How SMTP Verification Actually Works
A good email verifier doesn't just check for the '@' symbol. LeadStonk's verifier connects directly to the recipient's mail server and simulates the first step of sending an email, without actually sending it. If the server responds that the mailbox exists and can receive mail, it is marked as 'Valid'.
Dealing with Catch-All Domains
Some domains are configured as 'Catch-All' (or Accept-All), meaning they accept emails sent to any address at that domain, even if the specific inbox doesn't exist. These are risky. LeadStonk accurately flags catch-all domains so you can decide whether the risk is worth taking based on your domain's current reputation.
When Should You Verify Your Lists?
Rule of thumb: Verify every list immediately before launching a campaign. If you have an old list sitting in your CRM for over 3 months, re-verify it. People change jobs constantly; an email that was valid in January might bounce in April.
Conclusion
Email verification is the ultimate insurance policy for your cold outreach efforts. By running all your leads through LeadStonk's Email Verifier, you guarantee high deliverability and protect your domain's integrity. Don't risk your domain—verify today.
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