The only email verifier that works inside your compose window. See live verification badges the moment you add a recipient — before you type a single word. No tab switching. No copy-pasting. Just instant clarity. 🚀 How It Works Add a recipient → get an instant verdict: 🟢 Valid — safe to send 🔴 Invalid — will bounce 🟡 Risky — catch-all, role, or disposable ⚪ Unconfirmed — temporary limitation No risk: you get your credit back instantly for unconfirmed results. Hover any badge to see full details. You can also verify emails anytime from the popup. 🔍 What Gets Checked Qverio runs a deep, real-time analysis — not just format checks:

Deliverability verdict (Valid / Invalid / Risky / Unconfirmed)
Sendex™ quality score (0–100)
MX records and SMTP verification
Disposable email detection
Role-based detection (info@, support@, noreply@, admin@)
Free vs business email identification
Catch-all domain detection

✉️ Works Inside Your Email (Firefox Add-on) Qverio runs directly inside your browser-based email services:

Works in the compose window
Supports To, CC, and BCC fields
Handles multiple recipients at once

No setup. No workflow changes. ⚡ Verify On Demand Use the popup to verify any email instantly — even outside the compose window. Get a full breakdown in one view:

Deliverability
Quality score
Risk signals
Provider type

⚙️ Built for Control

Turn verification on/off anytime
Track live session stats (valid, invalid, risky)
Auto-connect with your account (no API key needed)

🔒 Privacy First

Only recipient email addresses are checked
No access to email content or subject lines
No tracking or analytics
No third-party data sharing
Data is automatically deleted every 90 days

🧩 Get Started in Seconds

Install the Firefox add-on
Enter your email
Click the login link

Done. You’re ready to verify. 💳 Free to Start - 20 free credits - No credit card required 1 credit = 1 verification (extension, dashboard, or API) Frequently Asked Questions (FAQ) ❓ Does this work inside my compose window? Yes — Qverio is the only email verifier Firefox add-on that works directly inside your compose window. As soon as you add a recipient in Gmail or other webmail, a verification badge appears instantly. ❓ Can I verify email addresses before sending emails in Gmail? Yes. Qverio lets you verify email addresses in real time before sending emails in Gmail and other webmail services. This helps reduce bounce rates and improve deliverability. ❓ Is this a Firefox email verifier add-on? Yes. Qverio is a Firefox add-on that verifies email addresses instantly while you compose emails in your browser. No copy-pasting or external tools required. ❓ Does it read my emails? No. Qverio only checks recipient email addresses (To, CC, BCC) for verification. It does not access your email content, inbox, sent items, or subject lines. ❓ Which email platforms does it support? Qverio works with all major browser-based email services, including Gmail and Outlook Web. If you send emails in your browser, Qverio works there. ❓ What is a “Risky” email? A risky email address exists but may reduce deliverability. This includes catch-all domains, role-based emails (like info@ or support@), or temporary email providers. ❓ What is the Sendex quality score? Sendex is Qverio’s 0–100 email quality score. It combines deliverability signals, domain reputation, and risk factors to help you decide whether to send. ❓ What happens if an email is “Unconfirmed”? “Unconfirmed” means the mail server temporarily limits verification. You get your credit back instantly for unconfirmed results, so there is no risk. ❓ How accurate is the email verification? Qverio performs real-time SMTP and domain-level checks to deliver highly accurate results. Some servers may restrict verification, which is why “Unconfirmed” results are safely refunded. ❓ How does email verification improve deliverability? Verifying emails before sending helps remove invalid and risky addresses. This reduces bounce rates, protects your sender reputation, and improves inbox placement. ❓ Is this useful for cold email outreach? Yes. Qverio is ideal for sales teams, founders, and marketers doing cold email outreach. It helps verify prospect emails before sending and prevents damage to sender reputation. ❓ Do I need to copy and paste emails into a verifier tool? No. Qverio works directly inside your compose window. You can verify emails instantly without switching tabs or using external tools. ❓ Can I verify multiple email addresses at once? Yes. Qverio verifies multiple recipients simultaneously across To, CC, and BCC fields in a single session. ❓ What happens when my credits run out? When your credits run out, the extension may show an “Invalid API” message and email verification will stop working. This happens when your account has no remaining credits or needs to be reactivated. When you hover over the badge, it shows: “Invalid API key / no credit”. You can fix this by topping up your credits or logging back into your account. Once updated, verification resumes instantly — your account and data remain unchanged. ⚡ Send smarter. Reduce bounces. Protect your reputation.

Latest version

Version 1.1.0

Older versions

Version 1.0.3