DNS Lookup, Email Deliverability Test & Network Tools - SPF, DKIM, DMARC Checker - mailX
Free email deliverability test, DNS lookup & IP lookup. Check MX records, SPF, DKIM, DMARC, blacklist status, SMTP servers & more. Analyze your domain instantly
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llms.txt Content
# MailX - Email Deliverability Tools
> Email deliverability tools for AI agents. Check SPF, DKIM, DMARC, BIMI, blacklists, SMTP/IMAP connectivity, and generate DNS records.
## MCP Server
MailX exposes all tools via MCP (Model Context Protocol) for AI agent integration.
- Endpoint: https://themailx.com/mcp
- Transport: Streamable HTTP (POST with JSON-RPC 2.0)
- Discovery: https://themailx.com/.well-known/mcp.json
### Client Configuration
Claude Desktop / Cursor:
```json
{
"mcpServers": {
"mailx": {
"type": "streamable-http",
"url": "https://themailx.com/mcp"
}
}
}
```
## Available Tools
- spf-check: 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.
- dkim-check: 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.
- dmarc-check: 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.
- bimi-check: 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.
- dmarc-generate: Generate a DMARC DNS record for a domain. Returns the record name, value, and type ready to be added to DNS.
- spf-generate: 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.
- smtp-check: Test an SMTP server connection by attempting to connect and authenticate. Optionally sends a test email to verify full sending capability.
- imap-check: Test an IMAP server connection by attempting to connect and authenticate. Use this to verify email receiving configuration.
- smtp-finder: