com.themailx/email-deliverability

Official16 tools

MailX Email Deliverability

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

Check email authentication records, blacklists, and SMTP/IMAP settings with DNS lookups.

Captured live from the server via tools/list.

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.

Parameters (1)

domain_namestringrequired
The domain to check SPF records for, e.g. example.com

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.

Parameters (2)

domain_namestringrequired
The domain to check DKIM records for, e.g. example.com
dkim_selectorstringrequired
The DKIM selector to look up, e.g. google, default, selector1

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.

Parameters (1)

domain_namestringrequired
The domain to check DMARC records for, e.g. example.com

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.

Parameters (1)

domain_namestringrequired
The domain to check BIMI records for, e.g. example.com

dmarc_generate

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

Parameters (3)

domain_namestringrequired
The domain to generate a DMARC record for, e.g. example.com
emailstringrequired
The email address to receive DMARC aggregate reports, e.g. dmarc@example.com
dmarc_policystringrequired
The DMARC policy: none (monitor only), quarantine (mark as spam), or reject (block entirely)

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.

Parameters (3)

domain_namestringrequired
The domain to generate an SPF record for, e.g. example.com
providerstringrequired
The mail provider identifier, e.g. google, mailgun, sendgrid, postmark, amazon-ses
hard_fail_booleanbooleanrequired
If true, uses strict -all policy (reject unauthorized senders). If false, uses soft ~all (mark but deliver).

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.

Parameters (7)

hoststringrequired
The SMTP server hostname, e.g. smtp.gmail.com
portintegerrequired
The SMTP port number, e.g. 587 for TLS, 465 for SSL, 25 for unencrypted
usernamestringrequired
The SMTP username for authentication
passwordstringrequired
The SMTP password or app-specific password
encryptionstringrequired
The encryption protocol: ssl, tls, or none
from_emailstring
Optional sender email address for sending a test email
to_emailstring
Optional recipient email address for sending a test email

imap_check

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

Parameters (5)

imap_hoststringrequired
The IMAP server hostname, e.g. imap.gmail.com
imap_portintegerrequired
The IMAP port number, e.g. 993 for SSL, 143 for unencrypted
usernamestringrequired
The IMAP username for authentication
passwordstringrequired
The IMAP password or app-specific password
imap_encryptionstringrequired
The encryption protocol: ssl, tls, or none

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.

Parameters (1)

provider_namestringrequired
The email provider name to look up, e.g. gmail, sendgrid, mailgun, outlook

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.

Parameters (1)

imap_provider_namestringrequired
The email provider name to look up, e.g. gmail, outlook, yahoo

blacklist_check

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

Parameters (1)

domain_namestringrequired
The domain name or IP address to check against blacklists, e.g. example.com or 1.2.3.4

mx_lookup

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

Parameters (1)

domain_namestringrequired
The domain to look up MX records for, e.g. example.com

txt_lookup

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

Parameters (1)

domain_namestringrequired
The domain to look up TXT records for, e.g. example.com

cname_lookup

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

Parameters (1)

domain_namestringrequired
The domain to look up CNAME records for, e.g. www.example.com

ptr_lookup

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

Parameters (1)

ip_addressstringrequired
The IP address to look up, e.g. 8.8.8.8 or 142.250.80.46

dns_lookup

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

Parameters (1)

domain_namestringrequired
The domain to look up all DNS records for, e.g. example.com

Install

claude_desktop_config.json

{
  "mcpServers": {
    "email-deliverability": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://themailx.com/mcp"
      ]
    }
  }
}

Desktop config is stdio-only; this bridges via mcp-remote. Native remote: Settings > Connectors.