Table of Contents

Mastering Email Verification & Qualification for Cold Email

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Domain Reputation Risks

Maintaining a healthy domain reputation is crucial for successful cold email campaigns. Two major threats:

• Spam complaints
• Email bounce rates </aside>

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Spam complaints are obvious threats, but bounce rates are often overlooked despite causing significant damage.

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Understanding Email Bounces

Email bouncing occurs when your email fails to reach its recipient and is returned, harming your sender reputation.

Causes of Email Bounces

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Common Reasons for Bounces:

• Invalid email address
• Mailbox full
• Server issues
• Blocked content or spam filtering by recipient’s email provider
• Size limits exceeded </aside>

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Blocked content (spam filters) is often underestimated as a bounce factor.

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Multi-layer Email Verification

To prevent email bounces, implement a robust multi-layer validation approach:

Layer 1: Basic Email Verification

This step involves checking emails to ensure they're valid and deliverable.

Typical Verification Categories:

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Only send to emails classified as “Good” without further validation.

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Recommended Email Verification Tool: Million Verifier

Benefits of Million Verifier:

• Bulk pricing (cost-effective for high volumes)
• API integration for automation

Typical Results from Million Verifier:

• Good: ~70-80%
• Risky: ~20-30%
• Bad: ~1-10% </aside>

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Expect about 75% good emails from typical Apollo or TrustedLeads exports even with built-in verifications.

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Advanced: Risky "Catchall" Email Verification

Many campaigns neglect "risky" emails, losing valuable leads.

What are Catchall Emails?

Catchalls accept all emails at a domain, making it difficult to verify if specific addresses exist.

Why Verify Risky Emails?

• About 50% of risky emails are actually deliverable.

How to Verify Risky Emails (Step-by-Step):

1. Export risky emails separately (from Million Verifier).
2. Use specialized verification tools:
   • Recommended: FindEmail.com
   • Alternative: Clay automation workflow </aside>

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Catchall verification is a hidden superpower—critical if your target audience is limited (small TAM).

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