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Mailx Tools

@Mailwarm

Repository

About Mailx Tools

MCP server for email deliverability: validate SPF/DKIM/DMARC/BIMI, check blacklists, test SMTP/IMAP, look up DNS, and generate ready-to-deploy records for any major email provider. Ships with two one-click prompts (audit-deliverability, setup-dns). Public, no auth.

#email#deliverability#spf#dkim#audit#dmarc#blacklist#spam#inbox#mx

Config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "mailx": {
      "type": "http",
      "url": "https://themailx.com/mcp"
    }
  }
}

Tools

16

Check if a domain has a valid SPF (Sender Policy Framework) DNS record. SPF specifies which mail servers are authorized to send email on behalf of a domain.

Check if a domain has a valid DKIM (DomainKeys Identified Mail) DNS record for a given selector. DKIM allows the receiver to verify that an email was sent by the domain owner.

Check if a domain has a valid DMARC (Domain-based Message Authentication, Reporting & Conformance) DNS record. DMARC tells receiving servers what to do with emails that fail SPF or DKIM checks.

Check if a domain has a valid BIMI (Brand Indicators for Message Identification) DNS record. BIMI allows brands to display their logo next to authenticated emails in supporting email clients.

Generate a DMARC DNS record for a domain. Returns the record name, value, and type ready to be added to DNS.

Generate an SPF DNS record for a domain based on the email provider being used. Returns the record name, value, and type ready to be added to DNS.

Test an SMTP server connection by attempting to connect and authenticate. If from_email and to_email are provided, the tool may attempt to send a test email. Only provide these fields if you are authorized to send from the account and intentionally want to test full sending capability.

Test an IMAP server connection by attempting to connect and authenticate. Use this to verify email receiving configuration.

Look up SMTP server settings (host, port, encryption) for a given email provider. Use this to find the correct SMTP configuration for services like Gmail, Outlook, SendGrid, etc.

Look up IMAP server settings (host, port, encryption) for a given email provider. Use this to find the correct IMAP configuration for services like Gmail, Outlook, Yahoo, etc.

Check if a domain or IP address is listed in popular email blacklists (DNSBLs). Being blacklisted can severely impact email deliverability.

Look up MX (Mail Exchanger) records for a domain. Returns the mail servers and their priorities.

Look up all TXT records for a domain. TXT records contain SPF policies, domain verification tokens, DKIM keys, and other metadata.

Look up CNAME (Canonical Name) records for a domain. Shows where a hostname aliases to.

Reverse DNS lookup. Find the hostname associated with an IP address. A valid PTR record is important for email sending reputation.

Look up all DNS records for a domain in one query. Returns A, AAAA, CNAME, MX, NS, TXT, and SOA records.

Overview

What is Mailx Tools?

Mailx Tools is an MCP server that provides email deliverability tools including SPF, DKIM, DMARC, and BIMI validation, blacklist checks, SMTP/IMAP connectivity tests, DNS lookups, and generation of ready-to-deploy DNS records. The package is a thin stdio bridge to the hosted MCP server at themailx.com, with all tool logic running server-side.

How to use Mailx Tools?

Install via npx -y @mailwarm/mailx-mcp and configure in your MCP client (e.g., Claude Desktop, Claude Code, Cursor). Optionally set default preferences like default_dkim_selector, preferred_provider, or dmarc_aggregate_email. Use built-in slash prompts audit-deliverability(domain) and setup-dns(domain, provider).

Key features of Mailx Tools

  • Validate SPF, DKIM, DMARC, and BIMI records
  • Check domains/IPs against DNS blacklists
  • Test SMTP and IMAP server connectivity
  • Perform DNS lookups (MX, TXT, CNAME, PTR, etc.)
  • Generate copy-pasteable SPF and DMARC records
  • Look up mail server settings by provider name

Use cases of Mailx Tools

  • Audit email deliverability for a domain (SPF, DKIM, DMARC, blacklist)
  • Set up DNS records for a new domain with a chosen email provider
  • Test SMTP/IMAP server connectivity with credentials
  • Check if a domain or IP is listed on DNS blacklists
  • Validate or debug existing email authentication records

FAQ from Mailx Tools

How does Mailx Tools differ from running

Comments

Basic information

Category

Developer Tools

Transports

stdio

Author

Mailwarm

Submitted by

Talal El Hamraoui

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