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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 m
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.
Official MCP server for MailX email deliverability tools — SPF, DKIM, DMARC, BIMI validation, domain/IP blacklist checks, SMTP/IMAP connectivity tests, DNS lookups (MX, TXT, CNAME, PTR, full A/AAAA/NS/SOA), and ready-to-deploy record generation for any major email provider.
This package is a thin stdio bridge to the hosted MCP server at https://themailx.com/mcp. All tool logic runs server-side; this is ~50 lines of passthrough glue so clients that want stdio (Claude Desktop, local agents) can use it without hand-wiring a remote URL.
Prefer the remote URL directly? Skip this package — point any streamable-HTTP MCP client straight at
https://themailx.com/mcp. See install guide for per-client JSON snippets.
spf_check, dkim_check, dmarc_check, bimi_check — validate authentication recordsblacklist_check — check a domain or IP against popular DNSBLssmtp_check, imap_check — test mail server connectivity with credentialssmtp_finder, imap_finder — look up server settings by provider namespf_generate, dmarc_generate — produce copy-pasteable DNS recordsmx_lookup, txt_lookup, cname_lookup, ptr_lookup, dns_lookup — DNS queriesbimi_host — host a BIMI SVG for email authenticationFull catalog + live descriptions: themailx.com/mcp/docs
Edit ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or the equivalent on your OS:
{
"mcpServers": {
"mailx": {
"command": "npx",
"args": ["-y", "@mailwarm/mailx-mcp"]
}
}
}
claude mcp add mailx -- npx -y @mailwarm/mailx-mcp
Same npx -y @mailwarm/mailx-mcp pattern — see your client's MCP config docs for the exact JSON shape. Full examples at themailx.com/mcp/docs.
If your client supports streamable-HTTP, point it at https://themailx.com/mcp directly — this bridge is only needed for stdio clients.
Optional session preferences (set once in your MCP client config, applied to every call):
| Variable | Effect |
|---|---|
default_dkim_selector |
Default selector used by dkim_check when the call omits dkim_selector |
preferred_provider |
Default provider for spf_generate (google, mailgun, sendgrid, postmark, amazon-ses, outlook, zoho, fastmail) |
dmarc_aggregate_email |
Default rua= address for dmarc_generate |
Override the upstream URL (staging/self-hosting):
{
"mcpServers": {
"mailx": {
"command": "npx",
"args": ["-y", "@mailwarm/mailx-mcp"],
"env": { "MAILX_MCP_URL": "https://tools-stg.themailx.com/mcp" }
}
}
}
Two one-click slash commands ship with the server:
audit-deliverability(domain) — full deliverability audit (SPF + DMARC + DKIM + blacklist) with copy-pasteable fixessetup-dns(domain, provider) — greenfield DNS setup, generates SPF + DMARC for the chosen providerMIT — see LICENSE
Add this to claude_desktop_config.json and restart Claude Desktop.
{
"mcpServers": {
"mailx-tools": {
"command": "npx",
"args": []
}
}
}