Email Deliverability Checker
Check SPF, DKIM, DMARC, blocklists, reverse DNS and email headers against Gmail/Yahoo sender rules.
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": {
"email-deliverability-mcp": {
"url": "https://api.ownmailserver.com/tools/mcp"
}
}
}Remote endpoints
https://api.ownmailserver.com/tools/mcpstreamable-httpWhat it can do
Tool inventory
Tools (3)
🟢check_domain(domain, dkim_selectors)
Check a domain's SPF (including the 10-DNS-lookup limit), DMARC policy and reporting, DKIM keys on common selectors, and MX records. Returns problems ranked by severity with the fix for each, plus the email services the domain uses.
Input Schema
{
"type": "object",
"properties": {
"domain": {
"type": "string",
"minLength": 3,
"maxLength": 253,
"description": "The domain, e.g. example.com (a URL or email address's domain also works)."
},
"dkim_selectors": {
"description": "Extra DKIM selectors to look for, e.g. from the s= value of a message's DKIM-Signature header.",
"maxItems": 10,
"type": "array",
"items": {
"type": "string",
"maxLength": 63
}
}
},
"required": [
"domain"
],
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢check_sending_ip(ip)
Check a mail server's IP: reverse DNS (PTR) and whether it resolves back to the IP, and listings on Spamhaus ZEN, Barracuda, SpamCop, PSBL, Mailspike and UCEPROTECT level 1. A refused Spamhaus query is reported as unknown, never as a listing.
Input Schema
{
"type": "object",
"properties": {
"ip": {
"type": "string",
"minLength": 2,
"maxLength": 45,
"description": "IPv4 or IPv6 address of the sending server."
}
},
"required": [
"ip"
],
"$schema": "http://json-schema.org/draft-07/schema#"
}🟢check_email_headers(headers)
Check a received email's headers against Gmail's and Yahoo's bulk sender requirements: SPF, DKIM and DMARC results, From domain alignment, one-click unsubscribe (and whether DKIM covers it), TLS, reverse DNS and Message-ID. Use the full headers as the recipient got them (Gmail: Show original).
Input Schema
{
"type": "object",
"properties": {
"headers": {
"type": "string",
"minLength": 10,
"maxLength": 200000,
"description": "The raw message headers (the body may be included; it's ignored)."
}
},
"required": [
"headers"
],
"$schema": "http://json-schema.org/draft-07/schema#"
}Community
Evidence