Verify emails in ChatGPT
ChatGPT can call SimpleVerifier's checks as tools once you add our MCP server (https://simpleverifier.com/api/mcp) and sign in. Ask "is this address real?" or paste a list, and ChatGPT runs the live mailbox check and reports valid, risky or invalid with the reason, without guessing.
Setup
- You need a SimpleVerifier plan with API and MCP access, and a ChatGPT plan or workspace that allows custom MCP servers. On Business, Enterprise or Edu an admin may need to allow it first.
- Open ChatGPT Plugins at chatgpt.com/plugins, select the plus button, then Add custom MCP server.
- Enter the name SimpleVerifier and, under Connection, the public endpoint https://simpleverifier.com/api/mcp, including the /mcp path.
- Choose OAuth for authentication, review the risk warning and continue, then select Create as a plugin and review the tools ChatGPT finds.
- Sign in with Google on the SimpleVerifier screen and choose Allow.
- Ask ChatGPT to verify an address. OpenAI renames these menus from time to time; if a label differs, the full guide is on /docs/mcp.
What people use it for
- Check a prospect's address while you write the email in ChatGPT.
- Paste up to 100 addresses and get them back sorted into send, send with care and do not send.
- Ask why a domain bounces: ChatGPT can read its MX, SPF, DMARC and catch-all status.
Using the result
Route on the status field: valid means the mail server confirmed the mailbox, risky means delivery could not be confirmed (catch-all domain, role address, provider that hides mailbox status), invalid means it will bounce or is a throwaway address. Keep risky out of cold sequences unless you accept the bounce risk. ChatGPT is told the same: it reports risky as risky and never upgrades an unconfirmed address to valid.
Full endpoint reference, error codes and an OpenAPI file are in the API docs. For lists of thousands of addresses, upload a CSV on the verify page instead.
Try it on your own list first
Upload a CSV and get 100 free checks in the dashboard, no card needed, to see the results before you connect ChatGPT. The ChatGPT setup itself needs a plan with API access.
Common questions
- Which plans include API access for ChatGPT?
- API access comes with Pro, Business and Agency, listed on the pricing page; Starter covers CSV verification only. A key on a plan without API access gets a 402 that says so. Each key can make 120 calls a minute.
- Is SimpleVerifier in ChatGPT's plugin directory?
- Not yet. Until it is, add it yourself as a custom MCP server with the steps above; it takes about two minutes.
- Does ChatGPT see my lists?
- It gets the addresses you give it in the chat, which it sends to SimpleVerifier to check, and the results of those checks. It can read a list's results only with that list's ID; it never sees your dashboard.
- Can I disconnect it?
- Yes. Remove the server in ChatGPT, and revoke the connection from your SimpleVerifier account; /docs/mcp shows where.