InboxGuards Email Check

com.inboxguardstest.apiPublished by api.inboxguardstest.comOfficial publisherv1.2.0Updated Oct 24, 2026

Check emails before you send, and get a $1 SPF/DKIM/DMARC fix plan for your domain. Pay per call.

VerifiedStreamable HTTPWeb executableCommunication & CollaborationSecurity & Monitoring

Overview

AI-generated overview

A remote MCP server that checks email addresses for deliverability and risk, and returns SPF, DKIM and DMARC fix plans for a domain.

What you can do
Validate an email address offline for syntax and normalized address and domain, free of charge and without network access or payment, before running a paid check. Look up the price of the paid address check and the HTTP-only email test report, the payment network and the receiving address. Check one address for syntax, whether the domain accepts mail, and disposable, role-account and free-provider flags, returning a verdict. Get a per-domain email security fix plan with the SPF, DKIM and DMARC records to create, replace or keep, plus click-path steps for common DNS hosts.
When to use it
Useful when an assistant needs to vet an address before sending mail, screen signups or lists for disposable or role accounts, or draft concrete SPF, DKIM and DMARC records for a domain's DNS host.
Requirements
A remote streamable HTTP endpoint; no package, environment variable or header is declared. The paid address check and the HTTP-only report require payment on the Base network to the address returned by the pricing tool.
Before you install
The address check and the fix plan are paid per call, so costs accrue with use; run the free syntax validation and pricing tools first. Payment is made in cryptocurrency on Base to an address the server supplies. Addresses and domains you submit are sent to a third-party API.

Installation

In SourceWeft

  1. Open InboxGuards Email Check in the dashboard and add it to a workspace.
  2. 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/com.inboxguardstest.api%2Femail/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": {
    "inboxguards-email-check": {
      "type": "http",
      "url": "https://api.inboxguardstest.com/mcp"
    }
  }
}

Tools

4

validate_email

Validate email syntax (free)

Free. Check the syntax of an email address offline and get the normalized address and domain, before paying for check_email_address. No DNS lookup, no network request, no payment.

Parametersemailrequired

pricing

Prices (free)

Free. Return the price of check_email_address (and of the HTTP-only email test report), the payment network (Base) and the receiving address. No input, no network request, no payment.

Takes no parameters.

check_email_address

Check one email address before you send to it: syntax, whether the domain accepts mail (MX, null MX or implicit A record), a disposable-domain flag (public CC0 list of about 9,900 domains), a role-account flag (info@, support@, noreply@...) and a free-provider flag. Returns a verdict of ok, risky or undeliverable with plain reasons. Use validate_email first if you only need syntax. No SMTP probe is made and no mail is sent, so it cannot confirm the mailbox exists. The address is not stored or logged. Read-only; one live DNS lookup via Cloudflare DoH. Costs $0.005 USDC per call via x402 (payment goes in _meta["x402/payment"]); invalid input or a DNS failure returns an error and is not charged.

Parametersemailrequired

email_fix_plan

Get an email security fix plan for one domain: the exact SPF, DKIM and DMARC DNS records to publish (create / replace / keep, record name, value and why), in order, plus click-path steps for the domain's DNS host (Cloudflare, GoDaddy, Route 53, Namecheap, Squarespace/Google, Vercel and others). Reads live MX, NS, SPF, DKIM and DMARC; detects Google Workspace, Microsoft 365, Zoho, Proton, Fastmail, GoDaddy and Cloudflare Email Routing; merges SPF within the 10-lookup limit, keeps existing senders, and stages DMARC none -> quarantine -> reject. Domains that send no mail get a lock-down set. Use it when mail lands in spam, before a DMARC rollout, or for a client. DKIM keys are generated by the mail provider, so for those it gives the exact console path. Read-only; nothing is stored. Costs $1 USDC per call via x402 (payment goes in _meta["x402/payment"]); invalid input, an unknown domain or a DNS failure returns an error and is not charged.

Parametersdomainrequired

Version history

3
  1. v1.2.0LatestOct 14, 2026
  2. v1.1.0Oct 13, 2026
  3. v1.0.0Oct 12, 2026

Score

83% 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
  • 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.