MailValid Email Verification

io.mailvalidPublished by mailvalid.ioOfficial publisherv1.0.0Updated Oct 24, 2026

Verify emails: syntax, MX, SMTP mailbox, disposable, role and catch-all checks. Single and bulk.

VerifiedStreamable HTTPWeb executableCommunication & CollaborationBusiness & Commerce

Overview

AI-generated overview

Lets an assistant verify email addresses through MailValid's remote API, checking syntax, MX records, SMTP mailboxes, disposable, role and catch-all status.

What you can do
MailValid Email Verification is a remote MCP server that exposes email verification checks to an assistant. It reports on syntax, MX records, SMTP mailbox existence, and whether an address is disposable, a role address, or catch-all. Verification is available for single addresses and in bulk.
When to use it
Useful when an assistant needs to clean a contact list, screen sign-up or lead emails before sending, or check whether an address is deliverable and not disposable or role-based.
Requirements
A remote endpoint at mailvalid.io over streamable HTTP. A MailValid API key is required and sent in the X-API-Key header; keys start with mv_live_ and are created in the MailValid dashboard. Network access to the service is needed.
Before you install
The server requires an API key sent as the X-API-Key header, so treat it as a secret. Email addresses submitted for verification are sent to a third-party service. Bulk verification may consume paid API quota; check the provider's pricing and data handling before use.

Installation

In SourceWeft

  1. Open MailValid Email Verification in the dashboard and add it to a workspace.
  2. Connect X-API-Key credentials. They are stored privately and never shown on public pages.
  3. Enable the server for the chats that should use its tools.

Web executable via Streamable HTTP. Remote servers run from the web runtime once configured in a workspace.

Use with an agent

Paste this prompt into Claude Code, Codex, Cursor or another agent — or into SourceWeft chat. The agent reads this server's install guide, shows you its publisher, endpoint and sign-in, and adds it to your client once you agree. Keys never go into a command.

Read https://sourceweft.com/mcp/io.mailvalid%2Femail-verifier/install.md and connect the MCP server it describes to my client. Before changing any config, show me its publisher, endpoint and sign-in method and wait for my OK. Never put an API key in a command or in a file I would commit; ask me where it should come from.

Read the install guide the agent follows

Other MCP clients

Add this to your client's mcpServers config.

{
  "mcpServers": {
    "mailvalid-email-verification": {
      "type": "http",
      "url": "https://mailvalid.io/mcp/",
      "headers": {
        "X-API-Key": "<YOUR_API_KEY>"
      }
    }
  }
}

Tools

6

verify_email

Verify an email address

Verify a single email's deliverability (syntax, DNS/MX, SMTP mailbox, disposable / role / catch-all detection, confidence score). Costs 1 credit for a billable result (valid/invalid/catch_all/do_not_mail), whether fresh or served from cache. `unknown` results are free. Requires an API key. Returns {success, credits_used, result}.

Parametersemailrequired

submit_bulk_verification

Submit a bulk verification job

Queue a list of emails for asynchronous verification. Reserves up to N credits (final charge settles on completion). Poll get_bulk_job for status and results. Optionally provide webhook_url for a completion callback. Requires an API key. Returns {job_id, status, total_emails, credits_reserved}.

Parametersemailsrequiredwebhook_url

get_bulk_job

Get a bulk job's status and results

Get the status, progress, and (when complete) results of a bulk job by its job_id. Requires an API key.

Parametersjob_idrequired

list_bulk_jobs

List your bulk jobs

List your recent bulk verification jobs (paginated, newest first). Optionally filter by status. Requires an API key.

Parameterspagestatuspage_size

cancel_bulk_job

Cancel a bulk job

Cancel a pending or processing bulk job and release any reserved credits. Requires an API key.

Parametersjob_idrequired

get_credit_balance

Get your credit balance

Return your current credit balance and lifetime usage. Requires an API key.

Takes no parameters.

Version history

1
  1. v1.0.0LatestOct 15, 2026

Score

72% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 daysRequired25 pts
  • Auth declaredRequired10 pts
  • Tools listedRequired15 pts
  • DescriptionRequired15 pts
  • Logo10 pts

    Publish an icon in the registry entry.

  • Documentation15 pts

    Declare a GitHub repository with a README, or serve resource_documentation in the OAuth protected-resource metadata.

  • LicenseNot applicable

    A hosted service is used under its provider's terms, so no license is expected here. This check is left out of the percentage.