Powerline Email Tools
Email deliverability checks: SPF, DKIM, DMARC, BIMI, MTA-STS, blacklists, headers, spam words
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-tools": {
"url": "https://powerline.ai/mcp"
}
}
}Remote endpoints
https://powerline.ai/mcpstreamable-httpWhat it can do
Tool inventory
Tools (5)
🟢check_domain(domain, dkim_selector)
Run every email-authentication check on a domain (SPF, DKIM, DMARC, MX, MTA-STS, TLS-RPT, BIMI, plus domain and mail-server blacklists) and return a score out of 100, per-check findings and a prioritized fix list. Use this first when asked whether a domain is set up correctly to send email.
Input Schema
{
"type": "object",
"properties": {
"domain": {
"type": "string",
"description": "Domain name, e.g. example.com. URLs and email addresses are accepted; the domain part is used."
},
"dkim_selector": {
"type": "string",
"description": "DKIM selector (the s= value from a DKIM-Signature header). Optional; common selectors are tried when omitted."
}
},
"required": [
"domain"
],
"additionalProperties": false
}🟢check_record(domain, record, selector, policy)
Look up and validate a single email DNS record for a domain, explaining each tag. record is one of spf, dmarc, dkim, bimi, mta-sts, tls-rpt, mx. SPF counts the 10-lookup limit; DMARC checks policy, reporting and external report authorization; DKIM sizes the key; MTA-STS fetches the policy file and compares it with the MX hosts; BIMI checks the logo (SVG Tiny PS) and mark certificate.
Input Schema
{
"type": "object",
"properties": {
"domain": {
"type": "string",
"description": "Domain name, e.g. example.com. URLs and email addresses are accepted; the domain part is used."
},
"record": {
"type": "string",
"enum": [
"spf",
"dmarc",
"dkim",
"bimi",
"mta-sts",
"tls-rpt",
"mx"
]
},
"selector": {
"type": "string",
"description": "DKIM or BIMI selector. Optional."
},
"policy": {
"type": "string",
"description": "MTA-STS only: policy file text to check instead of fetching it. Optional."
}
},
"required": [
"domain",
"record"
],
"additionalProperties": false
}🟢check_blacklists(target)
Check an IPv4 address against about 18 IP blacklists (SpamCop, Barracuda, UCEPROTECT, PSBL, Mailspike, ...) or a domain against domain blacklists. Each list is verified with its test entries first, so lists that refuse public resolvers (such as Spamhaus) are reported as unavailable rather than clean.
Input Schema
{
"type": "object",
"properties": {
"target": {
"type": "string",
"description": "IPv4 address or domain."
}
},
"required": [
"target"
],
"additionalProperties": false
}🟢analyze_headers(headers)
Parse raw email headers: the Received delivery path with per-hop delays, the receiving server's SPF/DKIM/DMARC verdicts, DMARC alignment of the From domain, DKIM signatures, the sending IP, and bulk-sender requirements such as one-click unsubscribe.
Input Schema
{
"type": "object",
"properties": {
"headers": {
"type": "string",
"description": "The raw header block (everything above the message body)."
}
},
"required": [
"headers"
],
"additionalProperties": false
}🟢check_spam_words(subject, body, rewrite)
Scan an email subject and body (plain text or HTML) for spam-trigger phrases by category, ALL-CAPS, exclamation runs, emoji, URL shorteners and image-heavy HTML. Returns a low/medium/high risk reading and, optionally, a rule-based rewrite.
Input Schema
{
"type": "object",
"properties": {
"subject": {
"type": "string"
},
"body": {
"type": "string",
"description": "Plain text or HTML."
},
"rewrite": {
"type": "boolean",
"description": "Also return a calmer rewrite of the subject (and of a plain-text body)."
}
},
"additionalProperties": false
}Community
Evidence