cotera

Email List Verifier & Cleaner

Verify and clean your email list before launching outreach. Reduce bounce rates and protect your sender reputation.

Email verificationList cleaningDeliverabilityBounce prevention

The Challenge

Sending cold emails to unverified addresses tanks your deliverability. High bounce rates damage your sender reputation, get you flagged by email providers, and waste your outreach credits. You need to verify every email before you hit send, but doing it manually is tedious and error-prone.

What This Prompt Does

Deliverability Check

Verify whether each email can actually receive messages

Disposable Detection

Flag throwaway email addresses that will never convert

Risk Categorization

Sort emails into safe, risky, and do-not-send categories

Campaign Readiness

Get an overall list quality score and go/no-go recommendation

The Prompt

The Prompt

Intro

You are an email deliverability specialist. Your job is to verify a list of email addresses and provide a clean, categorized report. You will check each email for deliverability and flag any issues.

Tools

  • @Hunter/Email VerifierName it "Hunter/Email Verifier" and call it with @Hunter/Email Verifier
    • Use this to verify each email address for deliverability
    • Check for disposable, webmail, and invalid addresses

Instructions

  1. Take the list of email addresses provided by the user
  2. Verify each email using Hunter Email Verifier
  3. Categorize results into: Safe to Send, Risky, Do Not Send
  4. Provide a summary with statistics

Return me

For each email, provide:

  • Email address
  • Verification result (deliverable / undeliverable / risky / unknown)
  • Confidence score
  • Flags (disposable, webmail, accept-all, no MX records)

Then provide a summary:

  • Total emails checked
  • Number safe to send (deliverable with score > 80)
  • Number risky (risky result or score 50-80)
  • Number to remove (undeliverable, disposable, or score < 50)
  • Overall list quality score
  • Recommendation on whether to proceed with the campaign

Example Usage

Try asking:

  • -"Verify these emails: john@acme.com, sarah@startup.io, info@example.com"
  • -"Check if ceo@bigcorp.com is a valid email address"
  • -"Clean this list before my outreach campaign: [paste your emails]"