MCP server

DemiSignal Official

com.demisignal/mcp

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Check a domain's DMARC, SPF, DKIM, MX, BIMI and MTA-STS records. Generate SPF and DMARC records.

Working at last checkVerified publisher: demisignal.comAbout 932 tokens per request once connected3 tools

https://demisignal.com/mcp?utm_source=mcp-registry

At a glance

Type: MCP server
Publisher: demisignal.com (verified by the MCP Registry)
Status: Working at last check
Tools: 3
Token cost: About 932 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http demisignal https://demisignal.com/mcp?utm_source=mcp-registry

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.demisignal]
url = "https://demisignal.com/mcp?utm_source=mcp-registry"

Gemini CLI

{"mcpServers":{"demisignal":{"httpUrl":"https://demisignal.com/mcp?utm_source=mcp-registry"}}}

Cursor

{"mcpServers":{"demisignal":{"url":"https://demisignal.com/mcp?utm_source=mcp-registry"}}}

VS Code

{"servers":{"demisignal":{"type":"http","url":"https://demisignal.com/mcp?utm_source=mcp-registry"}}}

Antigravity

agy mcp add demisignal https://demisignal.com/mcp?utm_source=mcp-registry

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"demisignal","server_url":"https://demisignal.com/mcp?utm_source=mcp-registry","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"demisignal","server_url":"https://demisignal.com/mcp?utm_source=mcp-registry"}

check_domain ~233 tokens
Look up a domain's live DNS and grade its email authentication: DMARC, SPF, DKIM (common selectors), MX, BIMI and MTA-STS. Returns each record, its status and the issues found, with a guide link per issue. A domain checked in the last few minutes is answered from that check (cached, with its age); p
generate_dmarc_record ~333 tokens
Build a DMARC TXT record and the host to publish it at, from a policy and the addresses that should receive aggregate reports. Notes what the record does not cover yet. Computes from the arguments only; nothing is looked up or stored.
generate_spf_record Sends messages · ~366 tokens
Build an SPF TXT record from the services and servers that send email for a domain, with an estimate of the DNS lookups it uses against SPF's limit of 10. Computes from the arguments only; nothing is looked up or stored.

Powerline Email Tools
Email deliverability checks: SPF, DKIM, DMARC, BIMI, MTA-STS, blacklists, headers, spam words
Pipefire email deliverability tools
Free email deliverability tools: SPF, DKIM, DMARC, blacklist and header checks, cold email scoring.
scan.mx Email Diagnostics
Email deliverability check: MX, SPF, DKIM, DMARC, blacklists, MTA-STS, DNSSEC, BIMI. Graded, no key.
Couryo free email tools
Free, no login: verify an email address, check SPF/DKIM/DMARC, explain SMTP errors, build SPF/DMARC.
MX Verdict
Free, read-only email and DNS checks: SPF, DKIM, DMARC, MX, DNS records, blocklists, domain health.
DnsGuard
Check a domain's email authentication: SPF, DKIM, DMARC, BIMI, MX, MTA-STS, TLS-RPT. Score + fixes.
Domainee
Custom domains API for SaaS: connect, verify, and manage customer domains, SSL, and DNS
MailX Email Deliverability
Check SPF/DKIM/DMARC/BIMI, blacklists, SMTP/IMAP; DNS lookups; generate email DNS records.

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