Directory / Pipefire email deliverability tools
Pipefire email deliverability tools
by pipefire.ai · https://pipefire.ai/mcp
Free email deliverability tools: SPF, DKIM, DMARC, blacklist and header checks, cold email scoring.
11 of 11 checks · 21 Oct 2026
What it can do
16 tools, in the server's own words.
check_domain_email_setupread-onlyCheck whether a domain is set up to send and receive email properly: MX, SPF, DKIM and DMARC in one go, each with pass/warn/fail, what was found, and how to fi…
check_dmarcread-onlyCheck a domain's DMARC record: whether one exists at _dmarc, its policy (none, quarantine, reject), whether reports are collected, and outdated tags.
check_spfread-onlyCheck a domain's SPF record: whether it exists, is valid, stays under the 10 DNS lookup limit, and ends with a sensible all mechanism.
check_dkimread-onlyLook up a domain's DKIM public key, trying the selectors Google Workspace, Microsoft 365 and common senders use, plus one you name.
check_mxread-onlyList a domain's mail servers (MX records) and which provider handles its email.
check_bimiread-onlyCheck a domain's BIMI record (logo in the inbox) and whether its DMARC policy is strict enough for BIMI to show.
check_mta_stsread-onlyCheck a domain's MTA-STS policy, which forces encrypted delivery of incoming mail.
check_blacklistsread-onlyCheck whether a domain's sending IPs, or a single IPv4 address, are listed on the major email blacklists (Spamhaus, Barracuda, SpamCop and others), with remova…
analyze_email_headersread-onlyRead the raw headers of a received email: SPF, DKIM and DMARC results, alignment, the delivery path and delays.
check_cold_emailread-onlyScore a cold email (subject and body) out of 10 against the rules Pipefire checks its own emails with: length, reading level, the ask, subject line, and spam-f…
test_subject_lineread-onlyScore a cold email subject line out of 10: length, wording that hurts opens, and spam trigger words, with fixes.
suggest_sending_domainsread-onlySuggest lookalike sending domains for cold email (so the main domain is never put at risk), with live .com/.net availability.
guess_email_addressesread-onlyList the likely email address formats for a person at a company domain (first@, first.last@, flast@ ...).
generate_spf_recordread-onlyBuild a valid SPF TXT record for a domain from the email services it sends with, with warnings about the 10-lookup limit.
generate_dmarc_recordread-onlyBuild a valid DMARC TXT record (to publish at _dmarc.yourdomain) from a policy and report addresses.
generate_dkim_recordread-onlyFormat a DKIM public key as the TXT record to publish at selector._domainkey.yourdomain.
Test results
Safe mode: only tools labeled read-only were run. How the test works
- !Ready for the newest MCP versionnote
1 warning
- !Uses an older MCP version (2025-11-25). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
- !Every tool is describednote
7 warnings
- !check_mx: Description uses vague words ("handles") instead of saying what it does and returns: "List a domain's mail servers (MX records) and which provider handles its email."
- !check_cold_email: Inputs with no description: subject, body
- !test_subject_line: Inputs with no description: subject
- !guess_email_addresses: Inputs with no description: first, last, middle, domain
- !generate_spf_record: Inputs with no description: ip4, ip6, a, mx
- !generate_dmarc_record: Inputs with no description: domain, subdomainPolicy
- !generate_dkim_record: Inputs with no description: selector, keyType
- ✓ConnectsConnected in 1.1 spass
- ✓Lists its toolsFound 16 toolspass
- ✓Tools are labeled safe or dangerousEvery tool has a safety labelpass
- ✓No hidden instructionsNo hidden instructions found in tool descriptionspass
- ✓Tools work with good inputspass
All good
- ✓check_domain_email_setup: Answered with an error, probably because of our sample input: "test" does not look like a domain. Try something like example.com.
- ✓check_dmarc: Answered with an error, probably because of our sample input: "test" does not look like a domain. Try something like example.com.
- ✓check_spf: Answered with an error, probably because of our sample input: "test" does not look like a domain. Try something like example.com.
- ✓check_dkim: Answered with an error, probably because of our sample input: "test" does not look like a domain. Try something like example.com.
- ✓check_mx: Answered with an error, probably because of our sample input: "test" does not look like a domain. Try something like example.com.
- ✓check_bimi: Answered with an error, probably because of our sample input: "test" does not look like a domain. Try something like example.com.
- ✓check_mta_sts: Answered with an error, probably because of our sample input: "test" does not look like a domain. Try something like example.com.
- ✓check_blacklists: Answered with an error, probably because of our sample input: That does not look like a domain or an IPv4 address.
- and 8 more
- ✓Bad inputs give a clean errorpass
All good
- ✓check_domain_email_setup: Refused missing required input "domain" with a clear error
- ✓check_domain_email_setup: Refused wrong type for "domain" with a clear error
- ✓check_dmarc: Refused missing required input "domain" with a clear error
- ✓check_dmarc: Refused wrong type for "domain" with a clear error
- ✓check_spf: Refused missing required input "domain" with a clear error
- ✓check_spf: Refused wrong type for "domain" with a clear error
- ✓check_dkim: Refused missing required input "domain" with a clear error
- ✓check_dkim: Refused wrong type for "domain" with a clear error
- and 20 more
- ✓Fast enoughpass
All good
- ✓Connecting took 1.1 s
- ✓Listing tools took 131 ms
- ✓Average tool answer: 138 ms
- ✓suggest_sending_domains: Slowest tool: suggest_sending_domains (329 ms)
- ✓No secrets leakedChecked 41 error messages: no secrets or internal detailspass
- ✓Resources and prompts workpass
All good (1 resource, 2 prompts)
- ✓Opened 1 of 1 resources
- ✓An address that does not exist gets a clean "not found" error
- ✓Opened 2 of 2 prompts
- –Tools work togetherNo tool's answer could be fed into another tool, so there were no chains to test (not counted either way)not tested
Test it yourself
Free and open source. Same checks, same score.
npx qamcp-cli https://pipefire.ai/mcpScore over time
- 21 Oct 202689
One test so far. New tests will show here.
Reviews
Coming soon: reviews from people who use Pipefire email deliverability tools, signed in with GitHub, one per person. Reviews never change the score.
Soon you can claim this page: re-test it from here, reply to results, and show a "Tested by QAmcp" badge.
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