MailX Email Deliverability MCP Server

by themailx Your server? Claim it

answering

MailX Email Deliverability is answering right now. Last checked 5 min ago. It exposes 16 tools.

Check SPF/DKIM/DMARC/BIMI, blacklists, SMTP/IMAP; DNS lookups; generate email DNS records.

Uptime history 51 days of history

51 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

654 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check MailX Email Deliverability every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 5 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add email-deliverability --transport http https://themailx.com/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "email-deliverability": {
      "url": "https://themailx.com/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.email-deliverability]
url = "https://themailx.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "email-deliverability": {
      "url": "https://themailx.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "email-deliverability": {
      "url": "https://themailx.com/mcp"
    }
  }
}

Available tools 16

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

dmarc

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.

dmarc_generate

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

imap

imap_check

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

imap_finder

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.

smtp

smtp_check

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.

smtp_finder

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.

spf

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.

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.

bimi

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.

blacklist

blacklist_check

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

cname

cname_lookup

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

dkim

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.

dns

dns_lookup

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

lookup

mx_lookup

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

ptr

ptr_lookup

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

txt

txt_lookup

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

Endpoints

URL	Transport	State	Latency	Checked
https://themailx.com/mcp	streamable-http	answering	645 ms	5 min ago

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MailX Email Deliverability — questions

Answers built from our own checks of this server.

What can MailX Email Deliverability do?

It exposes 16 tools, read directly from the server on our last check. Among them: bimi_check, blacklist_check, cname_lookup, dkim_check, dmarc_check, dmarc_generate and 10 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

What is MailX Email Deliverability mostly used for?

Its tools cluster around imap, spf and smtp. That is what this server is built to work with — the grouping comes from the actual tool names, not from a category we assigned.

Is MailX Email Deliverability working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 654 ms. The bar chart above shows every period we have measured.

How do I connect MailX Email Deliverability?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does MailX Email Deliverability need an API key?

No. MailX Email Deliverability completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 16 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is MailX Email Deliverability?

It answers our handshake in 654 ms on average, which is faster than 20% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.