MailX Email Deliverability
Check SPF/DKIM/DMARC/BIMI, blacklists, SMTP/IMAP; DNS lookups; generate email DNS records.
| Endpoint | https://themailx.com/mcp (streamable-http) |
|---|---|
| Registry version | 1.0.0 |
| Now | 17 tools · grade C (75) · pin ts_f963d952f5c9e012e09aa82422c47e70 · protocol 2025-06-18 |
| First / last listed | 2026-10-26 07:26 UTC / 2026-10-26 07:26 UTC |
| Grade over time | 2026-10-26: C (75), 17 tools |
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Tools: audit_domain spf_check dkim_check dmarc_check bimi_check dmarc_generate spf_generate smtp_check imap_check smtp_finder imap_finder blacklist_check mx_lookup txt_lookup cname_lookup ptr_lookup dns_lookup
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, blacklist and MX checks in one call and returns pass, warning or fail for each, an overall result, and the fixes to apply in priority order with help links. Takes about 10 seconds. mailX never changes DNS. params: domain_name*, dkim_selector |
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 pass/fail status and a fix suggestion. params: domain_name* |
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 Microsoft 365). If the selector is unknown, omit it: mailX then tries common selectors and returns the ones it finds. Returns the published key and its status. A miss on common selectors does not prove DKIM is absent. params: domain_name*, dkim_selector |
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 a fix suggestion. params: domain_name* |
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 fix suggestion. params: domain_name* |
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. params: domain_name*, email*, dmarc_policy* |
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 provider does not need a root SPF include. mailX does not publish it. params: domain_name*, provider*, hard_fail_boolean* |
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 reports whether connection, encryption and authentication succeed. If from_email and to_email are both given, it also sends one test email. Credentials are not stored. params: host*, port*, username*, password*, encryption*, from_email, to_email |
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 reports whether connection, encryption and authentication succeed. Credentials are not stored. params: imap_host*, imap_port*, username*, password*, imap_encryption* |
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, Amazon SES or SendGrid. Returns the host, ports with encryption, what to use to log in, and the provider's setup guide. Never asks for the user's credentials. params: provider_name* |
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, ports with encryption and the provider's setup guide. Never asks for the user's credentials. params: imap_provider_name* |
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. params: domain_name* |
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. params: domain_name* |
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 all live TXT records. params: domain_name* |
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. params: domain_name* |
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 to. params: ip_address* |
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. params: domain_name* |
Entries describe changes in tool definitions. They are not statements about a server, its quality or its author. The grade measures how the tool definitions fit model providers (token cost, schema compatibility, confusable names) as scored by the ToolFit engine at the time of the listing. JSON: append .json. Opt-out: how or hello@youraitools.co.