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Pipefire

Pipefire

by mikelovatt
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Remote

Pipefire email deliverability tools

Sixteen free email deliverability tools for your AI agent and your terminal. Check a domain's SPF, DKIM, DMARC, MX, BIMI and MTA-STS records, look it up on spam blacklists, read raw email headers, score a cold email and its subject line, and build SPF, DMARC and DKIM records.

Built by Pipefire, cold email software for agencies that sets up and runs outreach for you. The SPF, DMARC and MX checks use the same code Pipefire uses to check its own sending domains, and the cold email checker scores against the same writing rules.

No account. No API key. Nothing you check is stored.

Connect it to your AI agent

It runs as a remote MCP server (streamable HTTP):

https://pipefire.ai/mcp

  • LobeHub, Cline, Cursor or any MCP client: add a remote server with the URL above. See llms-install.md.

  • Claude Code: claude mcp add --transport http pipefire https://pipefire.ai/mcp

  • Gemini CLI: gemini extensions install https://github.com/mikelovatt/pipefire-cli

  • Claude and ChatGPT: step by step at pipefire.ai/mcp-server.

Then ask in plain words, for example "Is example.com set up to send email?" or "Score this cold email before I send it".

Pipefire customers: connect the same address in Claude, ChatGPT or Manus and sign in when asked. Your assistant can then read your campaigns, replies, mailboxes and results, draft a new campaign, rewrite a reply draft and pause or resume sending. It never sends an email or launches a campaign: those stay in the Pipefire console behind your click.

Related MCP server: Domain Deliverability Checker MCP Server

Tools

Every tool is read-only. Each one also has a free web version on pipefire.ai.

Tool

What it does

On the web

check_domain_email_setup

MX, SPF, DKIM and DMARC in one go, each with pass, warn or fail and how to fix it

Domain checker

check_dmarc

DMARC policy and reports. Tells you if the domain can be impersonated by email

DMARC checker

check_spf

SPF record, and whether it stays under the 10 DNS lookup limit

SPF checker

check_dkim

DKIM public key. Google Workspace, Microsoft 365 and common selectors are tried

DKIM checker

check_mx

Mail servers and which provider handles the domain's email

check_bimi

BIMI logo record, and whether DMARC is strict enough for it

BIMI checker

check_mta_sts

MTA-STS policy, which forces encrypted delivery of incoming mail

MTA-STS checker

check_blacklists

Whether the domain's sending IPs, or one IPv4 address, are on the major spam blacklists

Blacklist checker

analyze_email_headers

Reads raw email headers: SPF, DKIM and DMARC results, alignment, hops and delays

Header analyzer

check_cold_email

Scores a cold email out of 10 against the rules Pipefire checks its own emails with

Cold email checker

test_subject_line

Scores a subject line out of 10: length, wording that hurts opens, spam triggers

Subject line tester

suggest_sending_domains

Lookalike sending domains, so your main domain never sends cold email

Sending domain generator

guess_email_addresses

Likely email address formats for a person at a company

Email permutator

generate_spf_record

Builds an SPF record from the services the domain sends with

SPF generator

generate_dmarc_record

Builds a DMARC record from a policy and a reports address

DMARC generator

generate_dkim_record

Formats a DKIM public key as the TXT record to publish

DKIM generator

The server also offers a guides resource and two prompts: a full domain audit with a prioritised fix list, and "why did this land in spam?" from a message's headers.

From the terminal

The same tools as a command line app. Needs Node 18 or newer, no dependencies.

npx pipefire check example.com

Command

What it does

pipefire check <domain>

MX, SPF, DKIM and DMARC in one go

pipefire dmarc <domain>

DMARC policy and reports

pipefire spf <domain>

SPF record and the 10 DNS lookup limit

pipefire dkim <domain> [selector]

DKIM public key

pipefire mx <domain>

Mail servers and the email provider

pipefire bimi <domain>

BIMI logo record

pipefire mta-sts <domain>

MTA-STS policy

pipefire blacklist <domain or ip>

Spam blacklist lookup

pipefire headers < headers.txt

Read raw email headers

pipefire subject "<subject line>"

Score a cold email subject line

pipefire email --subject "..." < body.txt

Score a whole cold email

pipefire domains <brand>

Ideas for separate cold email sending domains

pipefire guess <first> <last> <domain>

Likely email address formats for a person

pipefire gen-dmarc <domain> --policy reject --rua you@x.com

Build a DMARC record

pipefire gen-spf google microsoft

Build an SPF record

Add --json to any command for raw output. Install it globally with npm install -g pipefire.

$ npx pipefire dmarc example.com
DMARC check for example.com

DMARC (policy and reports): WARN
  Record: v=DMARC1;p=reject;sp=reject;adkim=s;aspf=s
  Found: Policy p=reject, with no reports address.
  Fix: Add rua=mailto:you@yourdomain so you receive the daily reports that show who sends as you.

How it works

Every tool calls the same code as the free tools at pipefire.ai/tools, through Pipefire's public MCP endpoint. Checks are rate limited per IP. Nothing you check is stored.

About Pipefire

Pipefire is cold email software for agencies that sets up and runs outreach for you. It buys the sending domains, sets up the mailboxes and warms them for 14 days before any cold email goes out. It finds prospects, writes the emails, sends them at a safe daily pace and sorts the replies. You approve every email before it is sent, and your company domain never sends cold email.

License

MIT

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