Email Verification Guide — How to Check if an Email is Valid

Email verification is the process of checking whether an email address can actually receive messages — without sending anything. It involves multiple layers: format validation, DNS record lookup, server handshake, and security configuration analysis. At MailScout we run all of these checks in under a second.

Statistics from the last 24 hours of active use

We analyzed 250 email verifications across 159 domains. Only 7% were confirmed valid. That means 93% of checked addresses either bounced, belonged to dead accounts, or were on domains with no receiving server. Sending to unverified addresses doesn't just waste your time — it damages your sender reputation with ISPs.

1. Step 1: Syntax check — validates format against RFC 5322 rules
2. Step 2: DNS MX lookup — confirms the domain has a mail server
3. Step 3: SMTP handshake — connects to the server and asks if the mailbox exists
4. Step 4: Security analysis — checks SPF, DMARC, DKIM configuration
5. Step 5: Trust score — combines all signals into a 0-100 score

Among the 159 domains we've checked, 70% have no SPF record at all. That means anyone can forge emails from those domains. Only 17.6% have DMARC configured — the one protocol that actually tells receiving servers what to do with fakes. The top three email providers by volume are Google Workspace (15 domains), Microsoft 365 (13), and Tencent Exmail (7).

MailScout's free verifier runs all five checks above in real time. Enter any address on our homepage and get an instant trust score. For bulk checks, our batch tool handles up to 25 emails at once with full CSV export.