MX Verdict
Free, read-only email and DNS checks: SPF, DKIM, DMARC, MX, DNS records, blocklists, domain health.
Should I use this
Quality & Safety
Based on automated analysis of tool definitions and protocol compliance.
Context Cost
This is the approximate number of tokens consumed each time the server's tools are loaded into a model's context. Higher counts reduce the attention available for other tasks.
Install
One-Click Install
Add this to your `claude_desktop_config.json` file:
{
"mcpServers": {
"mxverdict": {
"url": "https://mxverdict.com/mcp"
}
}
}Remote endpoints
https://mxverdict.com/mcpstreamable-httpWhat it can do
Tool inventory
Tools (7)
🟢check_email_domain(domain)
Check everything about a domain's email setup in one call: SPF, DMARC, MX, DKIM on common selectors, domain blocklists, MTA-STS, TLS-RPT and BIMI. Use it for a general question such as "is email set up correctly for example.com".
Input Schema
{
"type": "object",
"properties": {
"domain": {
"type": "string",
"maxLength": 512,
"description": "Domain name, for example example.com."
}
},
"required": [
"domain"
],
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢check_spf(domain)
Check a domain's SPF record: whether it exists and is valid, how many of the 10 allowed DNS lookups it uses, and how its all mechanism treats mail from servers that are not listed.
Input Schema
{
"type": "object",
"properties": {
"domain": {
"type": "string",
"maxLength": 512,
"description": "Domain name, for example example.com."
}
},
"required": [
"domain"
],
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢check_dkim(domain, selector)
Check a domain's DKIM public keys in DNS. With a selector (the s= tag of a DKIM-Signature header), checks that selector's key; without one, probes common selector names. Finding no key on common names does not prove DKIM is missing: selectors cannot be listed from DNS.
Input Schema
{
"type": "object",
"properties": {
"domain": {
"type": "string",
"maxLength": 512,
"description": "Domain name, for example example.com."
},
"selector": {
"description": "DKIM selector, for example google or selector1. Leave out to probe common selectors.",
"type": "string",
"maxLength": 253
}
},
"required": [
"domain"
],
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢check_dmarc(domain)
Check a domain's DMARC record: whether it exists and is valid, its policy (none, quarantine or reject), alignment, and where reports are sent.
Input Schema
{
"type": "object",
"properties": {
"domain": {
"type": "string",
"maxLength": 512,
"description": "Domain name, for example example.com."
}
},
"required": [
"domain"
],
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢lookup_mx(domain)
Look up a domain's MX records (its incoming mail servers), their IP addresses and reverse DNS. DNS only: it does not connect to the mail servers.
Input Schema
{
"type": "object",
"properties": {
"domain": {
"type": "string",
"maxLength": 512,
"description": "Domain name, for example example.com."
}
},
"required": [
"domain"
],
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢dns_lookup(name, type)
Look up DNS records of a name. Type ALL (the default) queries A, AAAA, CNAME, MX, NS, TXT, SOA and CAA; any single type can be asked for. An IP address gives its reverse DNS (PTR) lookup.
Input Schema
{
"type": "object",
"properties": {
"name": {
"type": "string",
"maxLength": 512,
"description": "Domain name or IP address, for example example.com or _dmarc.example.com."
},
"type": {
"description": "Record type; ALL when left out.",
"type": "string",
"enum": [
"ALL",
"A",
"AAAA",
"CNAME",
"MX",
"NS",
"PTR",
"SOA",
"TXT",
"CAA",
"SRV",
"DS",
"DNSKEY",
"TLSA",
"HTTPS",
"SVCB"
]
}
},
"required": [
"name"
],
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢check_blacklist(target)
Check whether an IP address or a domain is listed on public DNS blocklists (DNSBLs). A domain is checked on domain blocklists only; to check a mail server, give its IP address.
Input Schema
{
"type": "object",
"properties": {
"target": {
"type": "string",
"maxLength": 512,
"description": "One IPv4 or IPv6 address, or one domain name."
}
},
"required": [
"target"
],
"$schema": "http://json-schema.org/draft-07/schema#"
}Community
Evidence