MailX Email Deliverability is an MCP server with 16 tools an agent can call, among them bimi_check, blacklist_check, cname_lookup. It answers at https://themailx.com/mcp over streamable HTTP, and it listed its tools to an anonymous client, so no sign-in was needed for that. Our probes reached it 6 of 6 times since 10 September 2026; the last check, on 19 October 2026, succeeded.
Check SPF/DKIM/DMARC/BIMI, blacklists, SMTP/IMAP; DNS lookups; generate email DNS records.
Description as the publisher wrote it.
| Tool | What it does |
|---|---|
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. Inputs: domain_name |
blacklist_check | Check if a domain or IP address is listed in popular email blacklists (DNSBLs). Being blacklisted can severely impact email deliverability. Inputs: domain_name |
cname_lookup | Look up CNAME (Canonical Name) records for a domain. Shows where a hostname aliases to. Inputs: domain_name |
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. Inputs: domain_name, dkim_selector |
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. Inputs: domain_name |
dmarc_generate | Generate a DMARC DNS record for a domain. Returns the record name, value, and type ready to be added to DNS. Inputs: domain_name, email, dmarc_policy |
dns_lookup | Look up all DNS records for a domain in one query. Returns A, AAAA, CNAME, MX, NS, TXT, and SOA records. Inputs: domain_name |
imap_check | Test an IMAP server connection by attempting to connect and authenticate. Use this to verify email receiving configuration. Inputs: imap_host, imap_port, username, password, imap_encryption |
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. Inputs: imap_provider_name |
mx_lookup | Look up MX (Mail Exchanger) records for a domain. Returns the mail servers and their priorities. Inputs: domain_name |
ptr_lookup | Reverse DNS lookup. Find the hostname associated with an IP address. A valid PTR record is important for email sending reputation. Inputs: ip_address |
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 inten Inputs: host, port, username, password, encryption, from_email |
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. Inputs: provider_name |
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. Inputs: domain_name |
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. Inputs: domain_name, provider, hard_fail_boolean |
txt_lookup | Look up all TXT records for a domain. TXT records contain SPF policies, domain verification tokens, DKIM keys, and other metadata. Inputs: domain_name |
Every block below points at https://themailx.com/mcp. Pick your client and copy.
claude mcp add --transport http mailx-email-deliverability https://themailx.com/mcp
{
"mcpServers": {
"mailx-email-deliverability": {
"command": "npx",
"args": ["-y", "mcp-remote", "https://themailx.com/mcp"]
}
}
}{
"mcpServers": {
"mailx-email-deliverability": {
"url": "https://themailx.com/mcp"
}
}
}{
"servers": {
"mailx-email-deliverability": {
"type": "http",
"url": "https://themailx.com/mcp"
}
}
}{
"context_servers": {
"mailx-email-deliverability": {
"url": "https://themailx.com/mcp"
}
}
}{
"mcpServers": {
"mailx-email-deliverability": {
"serverUrl": "https://themailx.com/mcp"
}
}
}{
"mcpServers": {
"mailx-email-deliverability": {
"url": "https://themailx.com/mcp"
}
}
}name: MailX Email Deliverability
version: 0.0.1
schema: v1
mcpServers:
- name: MailX Email Deliverability
type: streamable-http
url: https://themailx.com/mcp{
"mcpServers": {
"mailx-email-deliverability": {
"httpUrl": "https://themailx.com/mcp"
}
}
}{
"mcpServers": {
"mailx-email-deliverability": {
"type": "http",
"url": "https://themailx.com/mcp"
}
}
}{
"mcpServers": {
"mailx-email-deliverability": {
"url": "https://themailx.com/mcp"
}
}
}goose://extension?url=https%3A%2F%2Fthemailx.com%2Fmcp&type=streamable_http&id=mailx-email-deliverability&name=MailX%20Email%20Deliverability
It answered our last check on 19 October 2026 in 463 ms. Over 6 checks since 10 September 2026 it answered 6. Status here comes from Neuronto's own probes, not from the publisher.
Yes. It is published by themailx.com and served from themailx.com, the vendor's own domain: https://themailx.com/mcp.
16, as returned by the server's own tools/list on 11 September 2026: bimi_check, blacklist_check, cname_lookup, dkim_check, dmarc_check, dmarc_generate, dns_lookup, imap_check, and 8 more.
It answered our last check on 19 October 2026 in 463 ms. Over 6 checks since 10 September 2026 it answered 6.
Put the server under mcpServers in ~/.cursor/mcp.json with the URL https://themailx.com/mcp. The exact JSON is above, with the same setup for Claude Code, Claude Desktop, VS Code, Windsurf, Zed, Gemini CLI and the rest.
It listed its tools to an anonymous client, so reading the tool list needs no key. Individual tools can still ask for credentials in their own inputs.
Publisher: com.themailx. Endpoint host: themailx.com. ARD identifier: urn:air:com.themailx:mcp:email-deliverability.
First indexed 10 September 2026. The tools are exactly what the server returned; nothing on this page
is inferred from its name. Ranking in Neuronto search is never for sale.