Check SPF/DKIM/DMARC/BIMI, blacklists, SMTP/IMAP; DNS lookups; generate email DNS records.
Maintain this server? Claim it
Call this server's tools from your browser. Nothing to install.
Requests go through mcptry because browsers can't call most MCP servers directly. Header values are sent to the server for that request only and are never stored or logged.
Tool list from our last check. Connect live to refresh it.
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.
The domain to audit, e.g. example.com
The DKIM selector, e.g. google (Google Workspace), selector1 or selector2 (Microsoft 365). Optional: omit it to try common selectors.
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.
| Argument | Type | Description |
|---|---|---|
| domain_name* | string | The domain to audit, e.g. example.com |
| dkim_selector | string | The DKIM selector, e.g. google (Google Workspace), selector1 or selector2 (Microsoft 365). Optional: omit it to try common selectors. |
{
"type": "object",
"required": [
"domain_name"
],
"properties": {
"domain_name": {
"type": "string",
"description": "The domain to audit, e.g. example.com"
},
"dkim_selector": {
"type": "string",
"description": "The DKIM selector, e.g. google (Google Workspace), selector1 or selector2 (Microsoft 365). Optional: omit it to try common selectors."
}
}
}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.
| Argument | Type | Description |
|---|---|---|
| domain_name* | string | The domain to check BIMI records for, e.g. example.com |
{
"type": "object",
"required": [
"domain_name"
],
"properties": {
"domain_name": {
"type": "string",
"description": "The domain to check BIMI records for, e.g. example.com"
}
}
}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.
| Argument | Type | Description |
|---|---|---|
| domain_name* | string | The domain name or IP address to check against blacklists, e.g. example.com or 1.2.3.4 |
{
"type": "object",
"required": [
"domain_name"
],
"properties": {
"domain_name": {
"type": "string",
"description": "The domain name or IP address to check against blacklists, e.g. example.com or 1.2.3.4"
}
}
}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.
| Argument | Type | Description |
|---|---|---|
| domain_name* | string | The domain to look up CNAME records for, e.g. www.example.com |
{
"type": "object",
"required": [
"domain_name"
],
"properties": {
"domain_name": {
"type": "string",
"description": "The domain to look up CNAME records for, e.g. www.example.com"
}
}
}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.
| Argument | Type | Description |
|---|---|---|
| domain_name* | string | The domain to check DKIM records for, e.g. example.com |
| dkim_selector | string | The DKIM selector, e.g. google (Google Workspace), selector1 or selector2 (Microsoft 365). Optional: omit it to try common selectors. |
{
"type": "object",
"required": [
"domain_name"
],
"properties": {
"domain_name": {
"type": "string",
"description": "The domain to check DKIM records for, e.g. example.com"
},
"dkim_selector": {
"type": "string",
"description": "The DKIM selector, e.g. google (Google Workspace), selector1 or selector2 (Microsoft 365). Optional: omit it to try common selectors."
}
}
}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.
| Argument | Type | Description |
|---|---|---|
| domain_name* | string | The domain to check DMARC records for, e.g. example.com |
{
"type": "object",
"required": [
"domain_name"
],
"properties": {
"domain_name": {
"type": "string",
"description": "The domain to check DMARC records for, e.g. example.com"
}
}
}Use this when the user needs a DMARC record. Returns the record name, value and type ready to publish. mailX does not publish it.
| Argument | Type | Description |
|---|---|---|
| email* | string | The email address to receive DMARC aggregate reports, e.g. [email protected] |
| domain_name* | string | The domain to generate a DMARC record for, e.g. example.com |
| dmarc_policy* | string | The DMARC policy: none (monitor only), quarantine (mark as spam), or reject (block entirely) |
{
"type": "object",
"required": [
"domain_name",
"email",
"dmarc_policy"
],
"properties": {
"email": {
"type": "string",
"description": "The email address to receive DMARC aggregate reports, e.g. [email protected]"
},
"domain_name": {
"type": "string",
"description": "The domain to generate a DMARC record for, e.g. example.com"
},
"dmarc_policy": {
"enum": [
"none",
"quarantine",
"reject"
],
"type": "string",
"description": "The DMARC policy: none (monitor only), quarantine (mark as spam), or reject (block entirely)"
}
}
}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.
| Argument | Type | Description |
|---|---|---|
| domain_name* | string | The domain to look up all DNS records for, e.g. example.com |
{
"type": "object",
"required": [
"domain_name"
],
"properties": {
"domain_name": {
"type": "string",
"description": "The domain to look up all DNS records for, e.g. example.com"
}
}
}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.
| Argument | Type | Description |
|---|---|---|
| password* | string | The IMAP password or app-specific password |
| username* | string | The IMAP username for authentication |
| imap_host* | string | The IMAP server hostname, e.g. imap.gmail.com |
| imap_port* | integer | The IMAP port number, e.g. 993 for SSL, 143 for unencrypted |
| imap_encryption* | string | The encryption protocol: ssl, tls, or none |
{
"type": "object",
"required": [
"imap_host",
"imap_port",
"username",
"password",
"imap_encryption"
],
"properties": {
"password": {
"type": "string",
"description": "The IMAP password or app-specific password"
},
"username": {
"type": "string",
"description": "The IMAP username for authentication"
},
"imap_host": {
"type": "string",
"description": "The IMAP server hostname, e.g. imap.gmail.com"
},
"imap_port": {
"type": "integer",
"maximum": 65535,
"minimum": 1,
"description": "The IMAP port number, e.g. 993 for SSL, 143 for unencrypted"
},
"imap_encryption": {
"enum": [
"ssl",
"tls",
"none"
],
"type": "string",
"description": "The encryption protocol: ssl, tls, or none"
}
}
}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.
| Argument | Type | Description |
|---|---|---|
| imap_provider_name* | string | The email provider name to look up, e.g. gmail, outlook, yahoo |
{
"type": "object",
"required": [
"imap_provider_name"
],
"properties": {
"imap_provider_name": {
"type": "string",
"description": "The email provider name to look up, e.g. gmail, outlook, yahoo"
}
}
}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.
| Argument | Type | Description |
|---|---|---|
| domain_name* | string | The domain to look up MX records for, e.g. example.com |
{
"type": "object",
"required": [
"domain_name"
],
"properties": {
"domain_name": {
"type": "string",
"description": "The domain to look up MX records for, e.g. example.com"
}
}
}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.
| Argument | Type | Description |
|---|---|---|
| ip_address* | string | The IP address to look up, e.g. 8.8.8.8 or 142.250.80.46 |
{
"type": "object",
"required": [
"ip_address"
],
"properties": {
"ip_address": {
"type": "string",
"description": "The IP address to look up, e.g. 8.8.8.8 or 142.250.80.46"
}
}
}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.
| Argument | Type | Description |
|---|---|---|
| host* | string | The SMTP server hostname, e.g. smtp.gmail.com |
| port* | integer | The SMTP port number, e.g. 587 for TLS, 465 for SSL, 25 for unencrypted |
| password* | string | The SMTP password or app-specific password |
| to_email | string | Optional recipient email address for sending a test email |
| username* | string | The SMTP username for authentication |
| encryption* | string | The encryption protocol: ssl, tls, or none |
| from_email | string | Optional sender email address for sending a test email |
{
"type": "object",
"required": [
"host",
"port",
"username",
"password",
"encryption"
],
"properties": {
"host": {
"type": "string",
"description": "The SMTP server hostname, e.g. smtp.gmail.com"
},
"port": {
"type": "integer",
"maximum": 65535,
"minimum": 1,
"description": "The SMTP port number, e.g. 587 for TLS, 465 for SSL, 25 for unencrypted"
},
"password": {
"type": "string",
"description": "The SMTP password or app-specific password"
},
"to_email": {
"type": "string",
"description": "Optional recipient email address for sending a test email"
},
"username": {
"type": "string",
"description": "The SMTP username for authentication"
},
"encryption": {
"enum": [
"ssl",
"tls",
"none"
],
"type": "string",
"description": "The encryption protocol: ssl, tls, or none"
},
"from_email": {
"type": "string",
"description": "Optional sender email address for sending a test email"
}
}
}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.
| Argument | Type | Description |
|---|---|---|
| provider_name* | string | The email provider name to look up, e.g. gmail, sendgrid, mailgun, outlook |
{
"type": "object",
"required": [
"provider_name"
],
"properties": {
"provider_name": {
"type": "string",
"description": "The email provider name to look up, e.g. gmail, sendgrid, mailgun, outlook"
}
}
}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.
| Argument | Type | Description |
|---|---|---|
| domain_name* | string | The domain to check SPF records for, e.g. example.com |
{
"type": "object",
"required": [
"domain_name"
],
"properties": {
"domain_name": {
"type": "string",
"description": "The domain to check SPF records for, e.g. example.com"
}
}
}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.
| Argument | Type | Description |
|---|---|---|
| provider* | string | Email provider identifier. Google Workspace or Gmail = google. Microsoft 365, Office 365 or Outlook = microsoft. Amazon SES = amazon-ses. Common provider names are also accepted. |
| domain_name* | string | The domain to generate an SPF record for, e.g. example.com |
| hard_fail_boolean* | boolean | If true, uses strict -all policy (reject unauthorized senders). If false, uses soft ~all (mark but deliver). |
{
"type": "object",
"required": [
"domain_name",
"provider",
"hard_fail_boolean"
],
"properties": {
"provider": {
"enum": [
"activecampaign",
"amazon-ses",
"aweber",
"bluehost",
"brevo",
"campaign-monitor",
"constant-contact",
"elastic-email",
"fastmail",
"freshdesk",
"gandi",
"getresponse",
"godaddy",
"google",
"hostgator",
"hostinger",
"hubspot",
"icloud",
"infomaniak",
"intercom",
"ionos",
"ionos-eu",
"kit",
"klaviyo",
"mailbox-org",
"mailchimp",
"mailersend",
"mailgun",
"mailjet",
"mandrill",
"microsoft",
"migadu",
"moosend",
"namecheap",
"ovh",
"postmark",
"protonmail",
"purelymail",
"rackspace",
"resend",
"salesforce",
"sendgrid",
"smtp2go",
"sparkpost",
"titan",
"yandex",
"zendesk",
"zeptomail",
"zoho"
],
"type": "string",
"description": "Email provider identifier. Google Workspace or Gmail = google. Microsoft 365, Office 365 or Outlook = microsoft. Amazon SES = amazon-ses. Common provider names are also accepted."
},
"domain_name": {
"type": "string",
"description": "The domain to generate an SPF record for, e.g. example.com"
},
"hard_fail_boolean": {
"type": "boolean",
"description": "If true, uses strict -all policy (reject unauthorized senders). If false, uses soft ~all (mark but deliver)."
}
}
}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.
| Argument | Type | Description |
|---|---|---|
| domain_name* | string | The domain to look up TXT records for, e.g. example.com |
{
"type": "object",
"required": [
"domain_name"
],
"properties": {
"domain_name": {
"type": "string",
"description": "The domain to look up TXT records for, e.g. example.com"
}
}
}