MailTooth
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100 free credits · no card required

Verify emails before they bounce.

Check one address instantly or clean an entire list with syntax, domain, risk, and mailbox verification. See exactly why an address is safe, risky, or invalid.

Verify emails free See pricing
  • Up to 200 Quick checks
  • Pay only for conclusive results
  • Credits never expire
Deepcheck · 2 credits
Example verification resultSample
Verification status

Ready to send

Low-risk address with mailbox evidence

Syntax + domainPass
DisposableNot detected
MailboxDeliverable
Catch-allNo
model v1Evidence captured from 1 MX host
Unknown results refunded
Start where your email data lives
One address
CSV or TXT list
Real-time API
Mailbox Deepcheck

Protect every campaign

Stop preventable bounces before they reach your send queue.

Remove invalid addresses, review risky contacts, and reserve mailbox checks for the recipients that matter most.

VerifyRemove bad addressesProtect reputation

New · Resend campaigns

Verify the audience. Send the campaign. Keep one clean workflow.

Move directly from bulk verification results to a reviewed, personalized email campaign—without exporting your clean list into another tool first.

Start with verified results

Turn available bulk verification results into an audience and review every recipient before launch.

Personalize each message

Use first name, last name, and email variables, with recipient-level corrections when source data needs a fix.

Route through Resend

Send from one connected account or distribute recipients across multiple accounts with round-robin delivery.

Create a campaign Explore campaigns

MCP for agentic workflows

Give every agent a deliverability checkpoint.

Connect the MailTooth MCP server once. Your agents can verify an address and act on explicit evidence before they write, send, or trigger the next workflow.

  • Native verify_email tool
  • Structured, decision-ready results
  • Works before CRM writes, signups, and sends
Connect the MCP server See how it works

Compatible with Claude Code, Cursor, VS Code, Windsurf, OpenAI Agents, and custom Streamable HTTP clients.

Lead intake agent MCP connected
Agent request

Verify alex@northstar.io before creating the CRM contact.

MCP toolverify_email
deepcheck
Conclusive resultContinue
DeliverableMailbox checkedLow risk
No email sentDeepcheck · 2 credits

Built for teams

Share the workspace, not the password.

Give every teammate the access they need to verify, review, and manage email data together—while credits, tools, and activity stay organized in one place.

Invite teammates

Bring people into a workspace with protected email invitations instead of sharing a login.

Control every role

Assign owner, admin, member, or viewer access and tailor permissions to each person's work.

Keep work together

Organize credits, members, API keys, lists, and activity inside the workspace where they belong.

Switch workspaces

Move between teams without signing out while every workspace keeps its own access and resources.

Create your workspace

The full email toolkit

Checks and workflows that actually matter.

Verify individual addresses or complete lists, inspect the evidence behind each result, and turn the audience you approve into a Resend campaign.

01 · Email workflows

Verify, automate, and deliver from one platform.

Choose the interface that fits your verification, automation, and delivery needs.

01 · Delivery workflow

Email campaigns with Resend

Turn verified bulk results into a reviewed audience, personalize the message, and send through one or more connected Resend accounts.

02 · Website workflow

Form Protection

Add one script tag to signups, newsletters, waitlists, lead forms, trials, and checkout flows to block invalid and disposable emails before submission.

03 · Dashboard workflow

Single / Bulk Verification

Check one address instantly or upload CSV and TXT lists from the dashboard, choose a verification depth, and download structured results.

04 · API workflow

Bulk Verification API

Submit large verification jobs programmatically, monitor their progress, and retrieve complete results without manual uploads.

05 · Agent workflow

MCP for AI Agents

Connect the MailTooth MCP server so agents can verify an address, evaluate structured evidence, and choose the next action inside their workflow.

02 · Verification engine

Every check, clearly accounted for.

17 explicit checks
01

Address foundation

Validate the address format and identify who or what is behind it.

  • Syntax check

    Detect malformed addresses and invalid email formatting.

  • DNS MX check

    Confirm that the domain publishes mail-exchange records.

  • Disposable domain check

    Flag temporary and throwaway email services.

  • Role-based check

    Identify shared addresses such as support, sales, and info.

  • Personal vs professional

    Distinguish consumer mailboxes from business addresses.

  • Gender detection

    Infer a likely gender signal when the address provides enough evidence.

  • First name detection

    Extract a likely first name from supported address-name patterns.

  • Last name detection

    Extract a likely last name when the address contains a clear surname signal.

  • TLD risk and name signals

    Evaluate domain-ending risk and address-name patterns.

02

Domain intelligence

Assess the infrastructure, identity, and reputation of the domain.

  • Email provider detection

    Identify the provider responsible for receiving the email.

  • SPF, DKIM, and DMARC

    Inspect the domain's published email-authentication posture.

  • Blocklist and parked-domain risk

    Check DNSBL, RBL, and parked-domain risk indicators.

  • WHOIS domain context

    Use available registration context to support the risk decision.

03

Mailbox evidence

Use Deepcheck when the decision requires mailbox-level confidence.

  • SMTP mailbox verification

    Test mailbox acceptance without sending an email to the recipient.

  • Catch-all detection

    Identify domains that accept mail for any address.

  • Deliverability score

    Summarize the available signals into an actionable score.

  • Evidence from attempted MX hosts

    Show the mail-server attempts that support the final result.

Simple pay-once pricing

Start for free. Buy only when you need more.

100 free credits cover 200 Quick checks, 100 Standard checks, or 50 mailbox Deepchecks. Purchased credits never expire.

from$11for 3,600 Standard checks
Compare pricing Talk to us
Starter3,600 Standard checks
$11
GrowthMost popular10,200 Standard checks
$27
Pro32,600 Standard checks
$72
ScaleBest value55,000 Standard checks
$111
Quick checks use half a credit · unknown results are refunded

Choose the confidence you need

A signup check and a high-value send should not cost the same.

Start fast, add domain intelligence for list cleaning, or confirm the mailbox before an important send.

010.5 credit

Quick

Form checks and large first-pass lists

Fast address and domain screening before data enters your system.

  • Syntax and domain
  • MX records
  • Disposable and role-based
  • Personal vs professional
  • TLD risk and name signals
021 credit

Standard

CRM hygiene and campaign preparation

A richer domain-trust profile without an SMTP mailbox check.

  • Everything in Quick
  • Email provider detection
  • SPF, DKIM, and DMARC
  • Blocklist and parked-domain risk
  • WHOIS domain context
032 credits

Deepcheck

High-value outreach and critical sends

The complete check, including mailbox-level deliverability evidence.

  • Everything in Standard
  • SMTP mailbox verification
  • Catch-all detection
  • Deliverability score
  • Evidence from attempted MX hosts
Unknown should not cost the same as known.

Unknown API outcomes and failed executions are automatically refunded.

Built around real workflows

Start with the job you need to get done.

Use focused playbooks for product signups, sales outreach, and repeatable client list cleaning.

Cleaner product data

SaaS & product teams

Stop bad addresses at the edge of your productExplore workflow

More confident outreach

Sales & lead generation

Qualify the address before your rep presses sendExplore workflow

Repeatable client hygiene

Marketing agencies

Clean every client list with one accountable workflowExplore workflow

Direct answers before you start

Frequently asked questions

Inspect real results with 100 free credits before buying anything.

Verify emails free
01What does MailTooth verify?+

Depending on the selected depth, checks include syntax, domain and MX records, disposable and role-based addresses, personal or professional classification, TLD risk, provider detection, parked domains, SPF/DKIM/DMARC, blocklists, WHOIS, SMTP mailbox verification, and catch-all behavior.

02Do I need a credit card to start?+

No. New accounts receive 100 verification credits and can begin without adding a card.

03Do purchased credits expire?+

No. Credit packs are one-time purchases and purchased credits do not expire.

04What happens when a verification is inconclusive?+

Unknown API outcomes and failed executions are automatically refunded, so those checks do not consume your credit balance.

05Can I verify a file without writing code?+

Yes. Upload a CSV or TXT file in the dashboard, select the email column and verification depth, follow the job progress, and download the completed results.

06Can I protect a signup form without building an API integration?+

Yes. Create an origin-scoped Form Protection integration and embed its one-line JavaScript tag. It validates email fields before browser submission, adds a honeypot, supports configurable blocking rules, and keeps a separate rate limit and analytics history.

07Can developers verify emails in real time?+

Yes. Create a scoped API key and call the single-email verification endpoint. The product documentation includes request and response examples for all three depths.

08Does MailTooth work with AI tools?+

Yes. The Streamable HTTP MCP endpoint exposes a verify_email tool for compatible AI clients and agent frameworks, using the same tiered verification model, structured results, and API-key authentication.

09Can invalid email addresses hurt sender reputation?+

Repeated hard bounces can signal poor list hygiene and put domain and sender reputation at risk. Verifying before a send reduces avoidable bad-address attempts, but it should complement—not replace—consent, authentication, and responsible sending practices.

10Does verification send an email to the recipient?+

No. Deepcheck uses SMTP-level signals without sending a message to the address being checked.

Your first 100 credits are free

Clean data in. Better sends out.

Start without a card. Add credits only when the product has proved its value to your workflow.

Verify emails free