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Use Mailvett: Email Validation API for AI Agents MCP with Gemini CLI

Mailvett: validate emails. MX, provider, disposable/role/free flags, typo fix, verdict.

Remote MCP server (Streamable HTTP), nothing to install. Free: 50 free calls/day, no key · Paid: Cleaner $19/month; Growth $49/month; Agency $99/month; Cleaner yearly $190/year; Growth yearly $490/year; Agency yearly $990/year

Set it up

Run the command, or add the server to settings.json under "mcpServers".
Start Gemini CLI and run /mcp to list the server and its tools.
Ask a question the tools can answer.

Run:

gemini mcp add --transport http mailvett 'https://mailvett.cybermaxtools.com/mcp?via=use-with-gemini-cli'

Or add it to settings.json yourself::

{
  "mcpServers": {
    "mailvett": {
      "httpUrl": "https://mailvett.cybermaxtools.com/mcp?via=use-with-gemini-cli"
    }
  }
}

With a paid key:

gemini mcp add --transport http --header "x-api-key: YOUR_KEY" mailvett 'https://mailvett.cybermaxtools.com/mcp?via=use-with-gemini-cli'

Use the project file only if it is not committed with the key in it.

Where it goes:

~/.gemini/settings.json (user)
.gemini/settings.json (project, the default for the add command)

Config format checked 2026-10-09 against Gemini CLI's MCP documentation.

Tools you get

Endpoint checked 2026-10-09: https://mailvett.cybermaxtools.com/mcp answered an MCP initialize (protocol 2025-06-18) and tools/list with 1 tool, all marked read-only. No key was used and no tool was called.

Tool	What it does	Required inputs
`validate_emails`	Check up to 10 email addresses: syntax, whether the domain exists and has mail servers (MX), mail provider, disposable, role account (info@, sales@), free provider, likely typo with a suggested fix, domain age, SPF and DMARC. Returns verdict (deliverable_likely/risky/undeliverable/invalid), score 0-100 and reason codes per address. Does not verify that the mailbox itself exists.	`emails`

Test the endpoint from a terminal

This lists the tools without a key and without calling any of them:

curl -s https://mailvett.cybermaxtools.com/mcp \
  -H 'content-type: application/json' \
  -H 'accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'

If it does not work

Use "httpUrl" for Streamable HTTP; "url" is for the older SSE transport.
The docs note that for unpaid-tier and Google One users, Gemini CLI was replaced by Antigravity CLI on 18 June 2026.
The free tier has a daily limit (see the pricing line above); a paid key raises it.

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