# Email Verification: How to Clean Your Lists & Boost Deliverability Without Lifting a Finger.

> **Quick answer**: Email verification checks whether an email address is valid, deliverable, and safe to contact before you send a campaign. It prevents bounces, protects your sender reputation, and filters out risky or compromised addresses. Derrick automates bulk email verification inside Google Sheets with confidence scores ranging from very_sure (99% valid, under 1% bounce rate) to undeliverable, letting teams clean lists in minutes without code or third-party exports.

> **Summary** Stop guessing. Start verifying.Whether you’re launching a campaign or segmenting your leads, one bad email can wreck your deliverability—and your sender reputation. Most teams still blast emails to unverified lists or pay for overpriced enrichment tools. Smart teams, on the other hand, verify emails in bulk directly inside Google Sheets, without any dev work. In […]

*Published: 2025-05-12 · Updated: 2026-02-07 · Canonical: https://derrick-app.com/en/email-verification/*

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**Stop guessing. Start verifying.**
Whether you’re launching a campaign or segmenting your leads, one bad email can wreck your deliverability—and your sender reputation.

Most teams still blast emails to unverified lists or pay for overpriced enrichment tools. Smart teams, on the other hand, verify emails in bulk **directly inside Google Sheets**, without any dev work.

In today’s playbook, I’ll show you how to use Derrick App’s **Email Verify** feature to clean your CRM, improve deliverability, and identify compromised emails—fast.

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## Derrick App Features Used in This Playbook

- **Email Verify:** Instantly validate email addresses.
- **Google Sheets Automation:** Verify hundreds of emails in bulk directly from your spreadsheet

👉 Ready to protect your sender score? [Try Derrick App for free →](https://workspace.google.com/marketplace/app/linkedin_and_email_finder_derrick/3746789989)

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## Use Case : Clean Your Email List Before Hitting “Send”

### The Problem:

- You’re emailing leads, but you’re not sure which addresses are valid
- Bounced emails destroy your domain reputation and hurt future campaigns

### The Solution:

Use Derrick’s **Email Verify** to validate and scan every email in your list—**no code required**.

### Step-by-Step Implementation:

1. Create a Google Sheet with your email adresses
2. Open the **Derrick side panel** and select the **Email Verification** feature.
3. Choose the column with your email addresses
4. Click “Verify Emails”
5. Derrick adds these new columns automatically: - **Certaintly** :

| Certainly status | Description |
| --- | --- |
| very_sure / ultra_sure | 99% confidence level: The email has been verified by 3 sources. So these email addresses that have been verified three times have an average bounce rate inferior to 1%. |
| sure | 97% confidence level: The email has been verified by 2 sources. So these email addresses that have been verified three times have an average bounce rate inferior to 5%. |
| probable | The email address is risky. |
| undeliverable | The email address does not exist. |
| not_found | We have not found an email address for this domain or this person |

1. **Status** : Done or Error Error means, we have an internal error and you won’t be charge for it.

### The Results:

- Remove fake or invalid emails before they hurt your campaigns
- Identify risky or compromised addresses
- Focus your efforts on **real, reachable humans**

👉 Want to reduce bounces and protect your domain? [Try Derrick App now →](https://workspace.google.com/marketplace/app/linkedin_and_email_finder_derrick/3746789989)

## Pro Tips for Maximum Impact

- **Bulk verify before campaign launches** – not after the bounce report
- **Pair with other derrick features** to add company-level context
- **Prioritize custom domains** over generic ones for B2B
- **Save segments by trust level** (e.g. verified + not breached = high-value)

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## Start Sending Smarter Emails Today

With Derrick App’s **Email Verify**, you can:

✅ Protect your domain reputation
✅ Increase delivery and open rates
✅ Focus your time on real leads
✅ Enrich your lead scoring with zero technical skills

The best sales teams don’t just find leads—they **verify** them.
👉 Ready to clean your pipeline? [Try Derrick App for free →](https://workspace.google.com/marketplace/app/linkedin_and_email_finder_derrick/3746789989)