Allegrow
B2B email verification for catch-all and secure gateway contacts, with spam trap detection and a deliverability suite for outbound teams.
From $99/mo 14-day free trial MCP server API
Bottom line
Allegrow is a B2B email verification platform built for catch-all domains, secure email gateways and spam traps, with a deliverability toolkit on top. It suits agencies and sales teams emailing mid market and enterprise contacts who need conclusive answers on hard to verify addresses. Starter costs $99 a month, Scale Plus is $1,340 a month billed annually, and there is a 14 day free trial.
Stands out for: Beyond catch-all verdicts, Allegrow detects spam traps and known complainers and tags the primary mailbox for each contact, which most verifiers like ZeroBounce or NeverBounce do not attempt. Its Scale Plus plan offers unlimited verification inside HubSpot, Outreach and Salesloft, and it runs an official Claude connector.
Watch out for: The jump from Starter at $99 a month to Scale Plus at $1,340 a month billed annually is steep, and native integrations sit only on Scale Plus. API access on Starter is by request only.
Overview
Allegrow is a B2B focused email verification engine aimed at data providers and go to market teams. Its core claim is conclusive valid or invalid results on catch-all servers and secure email gateways, where most verifiers return unknown, along with detection of spam traps, disposables and inactive inboxes.
Verification on catch-all domains is signal based and never sends an email to the address. For gateways such as Proofpoint and Mimecast it uses automated greylisting resolution, and it routes checks through managed high quality IPs to reduce false unknowns.
Starter at $99 a month includes 5,000 credits, CSV cleaning, a Clay integration and one connected mailbox for domain health. Scale Plus at $1,340 a month billed annually adds unlimited verification, native HubSpot, Outreach and Salesloft integrations and workflow rules, while the API Plan is custom priced for data providers.
For a recruiting agency doing outbound into larger companies, Allegrow helps keep bad contacts out of sequences before they hurt sender reputation. Its Claude connector can check drafts for unsafe recipients, rank mailboxes by reputation and separate a data problem from a deliverability problem in a bounce audit.
Who it's for
Best for
- Agencies emailing enterprise hiring managers behind Proofpoint or Mimecast
- Outreach and Salesloft teams wanting in cadence verification
- Teams worried about spam traps hurting domain reputation
- Claude users who want verification and reputation checks in chat
Not ideal for
- Solo recruiters on a tight budget
- Teams that only need occasional CSV cleaning at low cost
- Buyers who want native integrations on an entry plan
Key features
Catch-all verification. Returns valid or invalid verdicts on catch-all contacts instead of unknown, using a signal based method that never sends emails to the address.
Secure gateway resolution. Uses automated greylisting resolution to verify contacts behind Proofpoint and Mimecast that SMTP checks get wrong.
Spam trap and risk detection. Flags spam traps, disposables, non primary aliases and dead inboxes, not just invalid addresses.
Primary email detection. Tags the mailbox a decision maker actually uses when several addresses verify as valid.
Deliverability suite. Tracks domain health and reputation for connected mailboxes, runs hourly SPF, DKIM and DMARC checks and automates positive email interactions.
Claude connector. Listed in the Claude connector directory, so Claude can verify contacts, rank mailboxes by reputation and run bounce audits.
MCP server
https://www.allegrow.co/integrations/claude-email-mcp
First-party MCP at www.allegrow.co. https://www.allegrow.co/integrations/claude-email-mcp.
Setup steps and live status MCP Directory Check your stack in the MCP readiness checker
Pricing
| Plan | Price | What you get |
|---|---|---|
| Starter | $99/mo | 5,000 credits a month, extra credits $8 per 1,000 |
| Scale Plus Unlimited | $1,340/mo | Billed annually, unlimited verification and native integrations |
Allegrow offers a 14 day free trial with up to 1,000 free verifications and no credit card. Starter costs $99 a month for 5,000 verification credits, CSV list cleaning, a Clay integration, one connected mailbox for domain health tracking and hourly authentication monitoring, with extra credits at $8 per 1,000 and extra users at $40 each. Scale Plus Unlimited costs $1,340 a month billed annually and adds unlimited verification, native HubSpot, Outreach and Salesloft integrations, workflow rules and a dedicated customer success manager. The API Plan for millions of monthly requests is custom priced. Confirm current terms on the vendor site.
Checked 4 Nov 2026. Vendors change prices without notice.
Is Allegrow expensive?
Allegrow does not publish a price. It is one of 4 quote-based tools among the 40 verification tools in our directory. 15 have a free tier, and those with a public price typically start around $34 a month.
- 4 quote-based
- 15 free tier
- 39 public price
Worked out automatically from every verification listing, so it updates as the directory changes.
Pros and cons
Pros
- Conclusive catch-all and gateway verdicts
- Spam trap and primary mailbox detection
- Official Claude connector
Cons
- Big price jump to Scale Plus
- Native integrations only on Scale Plus
- API on Starter by request
Integrations
HubSpot Outreach Salesloft Clay Apollo ZoomInfo Google Workspace Office 365
What's new at Allegrow
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How Allegrow compares
See all Allegrow alternatives, with what each one does differently and a head to head for every pairing.
| Tool | Free tier | From | MCP | API | Compare |
|---|---|---|---|---|---|
| | – | $99/mo | ✓ | ✓ | |
| | ✓ | $39/2,000 credits | ✓ | ✓ | Compare |
 Bouncer Bouncer suits smaller teams that want pay as you go verification without a $99 monthly commitment. | – | $8/1,000 credits | ✓ | ✓ | Compare |
| | – | $20/mo | – | – | Compare |
$39/2,000 credits Free tier MCP API
ZeroBounce is a cheaper self serve verifier for teams that do not need unlimited in cadence verification.
Bouncer$8/1,000 credits MCP API
Bouncer suits smaller teams that want pay as you go verification without a $99 monthly commitment.
$20/mo
MailReach is a better fit if mailbox warmup and spam testing matter more than contact verification.
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