mcp server
MailX Email Deliverability
Check SPF/DKIM/DMARC/BIMI, blacklists, SMTP/IMAP; DNS lookups; generate email DNS records.
Description as published by the maintainer. Source
- version 1.0.0
- slowing
slowing — Registry entry last updated 2026-04-17.
What this server can do
16 functions, named and described by the server itself. Parameter names are shown because they say more about what a function does than its name usually does.
bimi_check(domain_name)- 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. Required: domain_name.
blacklist_check(domain_name)- Check if a domain or IP address is listed in popular email blacklists (DNSBLs). Being blacklisted can severely impact email deliverability. Required: domain_name.
cname_lookup(domain_name)- Look up CNAME (Canonical Name) records for a domain. Shows where a hostname aliases to. Required: domain_name.
dkim_check(domain_name, dkim_selector)- 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. Required: domain_name, dkim_selector.
dmarc_check(domain_name)- 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. Required: domain_name.
dmarc_generate(email, domain_name, dmarc_policy)- Generate a DMARC DNS record for a domain. Returns the record name, value, and type ready to be added to DNS. Required: domain_name, email, dmarc_policy.
dns_lookup(domain_name)- Look up all DNS records for a domain in one query. Returns A, AAAA, CNAME, MX, NS, TXT, and SOA records. Required: domain_name.
imap_check(password, username, imap_host, imap_port, imap_encryption)- Test an IMAP server connection by attempting to connect and authenticate. Use this to verify email receiving configuration. Required: imap_host, imap_port, username, password, imap_encryption.
imap_finder(imap_provider_name)- 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. Required: imap_provider_name.
mx_lookup(domain_name)- Look up MX (Mail Exchanger) records for a domain. Returns the mail servers and their priorities. Required: domain_name.
ptr_lookup(ip_address)- Reverse DNS lookup. Find the hostname associated with an IP address. A valid PTR record is important for email sending reputation. Required: ip_address.
smtp_check(host, port, password, to_email, username, encryption, from_email)- 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. Required: host, port, username, password, encryption.
smtp_finder(provider_name)- 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. Required: provider_name.
spf_check(domain_name)- 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. Required: domain_name.
spf_generate(provider, domain_name, hard_fail_boolean)- 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. Required: domain_name, provider, hard_fail_boolean.
txt_lookup(domain_name)- Look up all TXT records for a domain. TXT records contain SPF policies, domain verification tokens, DKIM keys, and other metadata. Required: domain_name.
Last successful function declaration observed on . Source: https://themailx.com/mcp. We list what the server declared; we do not call any of these functions.
Endpoint status observed on . Source: https://themailx.com/mcp.
Signals
These are separate measurements of different things. They are deliberately not combined into one score, because a popularity number that mixes website traffic with saves and stars cannot be checked or acted on.
| Signal | Value | What it measures | Window | Observed | Source |
|---|---|---|---|---|---|
| Latest published version | 1.0.0 | Latest version string the maintainer published to the registry. | as of fetch | Model Context Protocol | |
| Registry record last updated | 2026-04-17 | When the registry record was last updated by its maintainer. | point in time | Model Context Protocol | |
| First listed in the MCP Registry | 2026-04-17 | Date this server was first published to the official MCP Registry. Not a usage or quality measure. | point in time | Model Context Protocol | |
| mcp tools declared | 16 tools | Number of functions the server itself declared when asked to list them. This is what the server offers an agent, not a measure of how well any of them work. | as of probe | themailx.com | |
| mcp endpoint status | ok | The server listed 16 functions when asked. | as of probe | themailx.com |
Where to get it
This record as data
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