MCP server

MailX Email Deliverability

com.themailx/email-deliverability

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Working at last checkVerified publisher: themailx.comAbout 2,947 tokens per request once connected17 tools

Website

https://themailx.com/mcp

At a glance

Type: MCP server
Publisher: themailx.com (verified by the MCP Registry)
Status: Working at last check
Tools: 17
Token cost: About 2,947 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to Cursor Add to VS Code VS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

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

Gemini CLI

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

Cursor

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

VS Code

{"servers":{"email-deliverability":{"type":"http","url":"https://themailx.com/mcp"}}}

Antigravity

agy mcp add email-deliverability https://themailx.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"email-deliverability","server_url":"https://themailx.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"email-deliverability","server_url":"https://themailx.com/mcp"}

Tools

audit_domain ~215 tokens
Use this when the user asks why their emails go to spam or wants a full deliverability check of a domain. Runs SPF, DKIM (finds the selector on its own), DMARC, blacklist and MX checks in one call and returns pass, warning or fail for each, an overall result, and the fixes to apply in priority order
bimi_check ~112 tokens
Use this when the user asks about BIMI or showing a brand logo next to their emails in inboxes. Returns the live BIMI record, the logo URL it declares, and a fix suggestion.
blacklist_check ~117 tokens
Use this when the user suspects their domain is blacklisted or blocked. Checks the domain against major DNS blocklists and returns the result for each list.
cname_lookup ~111 tokens
Use this when the user wants to know whether a hostname is an alias of another one, for example to verify DKIM or tracking CNAMEs. Returns the live CNAME target.
dkim_check ~222 tokens
Use this when the user wants to verify DKIM for a domain. Pass the DKIM selector if known (for example google for Google Workspace, selector1 or selector2 for Microsoft 365). If the selector is unknown, omit it: mailX then tries common selectors and returns the ones it finds. Returns the published k
dmarc_check ~113 tokens
Use this when the user asks about DMARC, spoofing protection, or what happens to emails that fail authentication. Returns the live DMARC record, its policy and a fix suggestion.
dmarc_generate ~194 tokens
Use this when the user needs a DMARC record. Returns the record name, value and type ready to publish. mailX does not publish it.
dns_lookup ~106 tokens
Use this when the user wants every DNS record for a domain in one view (A, AAAA, CNAME, MX, NS, TXT, SOA). Returns the live records grouped by type.
imap_check ~267 tokens
Use this only when the user explicitly asks to test an IMAP login for a mailbox they control and provides its credentials. Connects to the IMAP server and reports whether connection, encryption and authentication succeed. Credentials are not stored.
imap_finder ~140 tokens
Use this when the user needs the incoming mail (IMAP) server settings for an email provider, such as Gmail, Outlook, Yahoo, iCloud or Zoho. Returns the host, ports with encryption and the provider's setup guide. Never asks for the user's credentials.
mx_lookup ~103 tokens
Use this when the user wants to know which mail servers receive email for a domain. Returns the domain's live MX records with their priorities.
ptr_lookup ~108 tokens
Use this when the user wants the reverse DNS (PTR) of an IP address, for example to check a sending server's reverse DNS. Returns the hostname the IP resolves to.
smtp_check ~342 tokens
Use this only when the user explicitly asks to test an SMTP login for a mail account they control and provides its credentials. Connects to the SMTP server and reports whether connection, encryption and authentication succeed. If from_email and to_email are both given, it also sends one test email.
smtp_finder ~159 tokens
Use this when the user needs the outgoing mail (SMTP) server settings for an email provider or sending service, such as Gmail, Outlook, Microsoft 365, Zoho, Amazon SES or SendGrid. Returns the host, ports with encryption, what to use to log in, and the provider's setup guide. Never asks for the user
spf_check Sends messages · ~118 tokens
Use this when the user asks whether a domain's SPF record is valid, which servers may send email for a domain, or why SPF fails. Returns the live SPF record, a pass/fail status and a fix suggestion.
spf_generate ~406 tokens
Use this when the user needs a new SPF record for their email provider. Returns a TXT record ready to publish, or explains what to set up instead when the provider does not need a root SPF include. mailX does not publish it.
txt_lookup ~114 tokens
Use this when the user wants to see a domain's TXT records, for example to find verification tokens or check what SPF or other policies are published. Returns all live TXT records.

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