# Themailx Email Deliverability MCP server

Source: https://glimind.com/server/mcp-registry%2Fcom.themailx%2Femail-deliverability
Registry id: `mcp-registry/com.themailx/email-deliverability`
Status: live (checked 2026-10-27T16:07:02.731Z)

## Verdict

Themailx Email Deliverability MCP server answered 100% of Glimind's liveness checks over 30 days, better than 42% of MCP servers, with 680 ms median handshake and 0 outages in 90 days. Its agent-readiness grade is A (95/100) across 17 tools, costing an agent about 2,863 tokens to load. Checked every few minutes; no tool is ever called.

## Measurements (30 days)

| Metric | Value | Better than |
|---|---|---|
| Uptime, 30 days | 100% | 42% of MCP servers |
| Median handshake latency | 680 ms | 30% of MCP servers |
| p95 handshake latency | 3038 ms | — |
| Checks in 30 days | 5,063 | — |
| Outages, 90 days | 0 | — |
| Median recovery | — | — |
| Agent-readiness score | 95/100 (A) | 79% of MCP servers |
| Tools | 17 | — |
| Tool-list size for an agent | ~2,863 tokens | 46% of MCP servers |
| Days observed | 29 | — |

## Install

```json
{
  "mcpServers": {
    "themailx-email-deliverability-mcp-server": {
      "type": "http",
      "url": "https://themailx.com/mcp"
    }
  }
}
```

Claude Code:

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

## Tools (17)

- `audit_domain`: 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,
- `bimi_check`: 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 fi
- `blacklist_check`: 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`: 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`: 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 M
- `dmarc_check`: 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 
- `dmarc_generate`: 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`: 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`: 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 repor
- `imap_finder`: 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, po
- `mx_lookup`: 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`: 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 t
- `smtp_check`: 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 
- `smtp_finder`: 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, Ama
- `spf_check`: 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 
- `spf_generate`: 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 provi
- `txt_lookup`: 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 a

Measured by Glimind (https://glimind.com): MCP handshake + tool list only, no tool is ever called. CC BY 4.0.