Use cases

What you can build on EmailPal

Practical guides for building on EmailPal: resell email verification, provision mailboxes by API, run cold email infrastructure from an AI agent, and fix spam placement.

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Use cases

Verification

Build and resell your own email verification service

Build your own paid email verification service on the EmailPal API: your auth and billing in front, one server-side key behind. Blocks of 500 checks a day are $9.95/month, about $0.0007 per check at full use.

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Email verification API: verdicts, limits, pricing, code

EmailPal email verification API: POST /verify for one address, POST /lists/verify for files. Eight statuses, 500 to 4,500 checks a day included, extra blocks of 500/day at $9.95/month.

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Add email verification to a signup form

Verify an email on signup with one server-side POST /verify call. Timeout and fail-open handling, what to do with catch-all, unknown and role addresses, and a Next.js route handler.

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Catch-all emails: how to detect them and whether to send

A catch-all domain accepts mail for any address, so a yes proves nothing. How EmailPal detects them with one RCPT TO probe per domain cached for a day, and whether to send.

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Use cases

Agencies

Run cold email infrastructure for multiple clients

Run cold email infrastructure for several clients from one EmailPal account: tenant tags, bulk provisioning, 10 clients x 5 mailboxes from about $99/mo. No client workspaces.

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Provision cold email mailboxes by API

Create cold email domains and up to 100 mailboxes per call with the EmailPal REST API: SPF, DKIM and DMARC written automatically, SMTP/IMAP credentials by export.

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Use cases

AI agents

Let an AI agent run cold email infrastructure via MCP

Connect Claude or Cursor to EmailPal with npx -y @emailpal/mcp: 75 tools for domains, mailboxes, warming, verification and campaigns, with a read-only mode.

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Clean a lead list from an AI agent with verify_list

Verify a lead list from Claude or Cursor with the verify_list MCP tool: one credit per address, 500 to 4,500 a day, refused up front with 429 if the list does not fit.

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Use cases

Troubleshooting

Why cold emails go to spam: a checklist

A prioritized checklist for why cold emails land in spam: authentication, new-domain reputation, volume per mailbox, bounce rate, content, complaints and shared IPs.

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How to warm up a new domain for cold email

Step-by-step warm-up for a new cold email domain: 14-day timeline, daily ramp, what campaign-ready means, volume limits, and the pre-warmed alternative with real costs.

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Start building today

Domains, mailboxes, warming and verification over one REST API and MCP server.

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