mailX by mailwarm MCP server

• Registry namecom.themailx/email-deliverabilityverified in the MCP registry

The registry name sits under themailx.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

• Stateanswerschecked 2026-10-09
• Tools16
• Server calls itselfmailx-deliverability
• Server version1.0.0
• Protocol version2025-06-18

On 2026-10-09 the server answered initialize and tools/list without a sign-in. First answer in 267 ms.

• 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.

• 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.

• 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.

• 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.

• dmarc_generate

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

• 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.

• 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…

• imap_check

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

• 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.

• 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.

• blacklist_check

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

• mx_lookup

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

• txt_lookup

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

• cname_lookup

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

• ptr_lookup

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

• dns_lookup

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