DemiSignal
by demisignal.com · com.demisignal/mcp
Check a domain's DMARC, SPF, DKIM, MX, BIMI and MTA-STS records. Generate SPF and DMARC records.
- Category
- Other
- Connection
- Remote (HTTP)
- Tools
- 3 reported
- Status
- Online
Connect it to your AI
Claude Code
claude mcp add --transport http demisignal https://demisignal.com/mcp?utm_source=mcp-registryClaude, ChatGPT, Cursor and other apps
Add it as a custom connector with this URL (Streamable HTTP):
https://demisignal.com/mcp?utm_source=mcp-registryCursor, VS Code and other apps (mcp.json)
{
"mcpServers": {
"demisignal": {
"url": "https://demisignal.com/mcp?utm_source=mcp-registry"
}
}
}Tools it offers
3 tools, as the server itself reported during our check on Oct 31, 2026.
check_domainLook 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 checkgenerate_spf_recordBuild 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.generate_dmarc_recordBuild 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
Questions
What is the DemiSignal MCP server?
Check a domain's DMARC, SPF, DKIM, MX, BIMI and MTA-STS records. Generate SPF and DMARC records. It is made by demisignal.com and listed in the official MCP Registry as com.demisignal/mcp. MCP (Model Context Protocol) is the open standard that lets AI apps like Claude, ChatGPT and Cursor use outside tools.
How do I add DemiSignal to Claude?
In the Claude app or claude.ai, open Settings, then Connectors, choose "Add custom connector" and paste https://demisignal.com/mcp?utm_source=mcp-registry. In Claude Code, run: claude mcp add --transport http demisignal https://demisignal.com/mcp?utm_source=mcp-registry
How do I add DemiSignal to ChatGPT?
ChatGPT can use remote MCP servers as connectors. In ChatGPT settings, under Apps and Connectors, turn on developer mode if asked, create a new connector and paste https://demisignal.com/mcp?utm_source=mcp-registry.
How do I add DemiSignal to Cursor?
Open Cursor settings, go to MCP, choose "Add new MCP server" (or edit ~/.cursor/mcp.json) and add: { "mcpServers": { "demisignal": { "url": "https://demisignal.com/mcp?utm_source=mcp-registry" } } }
Does DemiSignal work right now?
Yes. It responded when we last checked on 31 Oct 2026. We check remote MCP servers every day.
What can DemiSignal do?
It gives your AI 3 tools, including check_domain, generate_spf_record, generate_dmarc_record. The full list is on this page.
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Markdown (GitHub README)
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