SpamFixer Email Deliverability Check

com.spamfixer/email-deliverability-checkVersion 1.0.0

Why do a domain's emails go to spam? Checks SPF, DKIM, DMARC, MX and blocklists. Free, no login.

Status

Responds566 msNov 14, 2026, 14:16 UTCAnswered our handshake without sign-in.

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Data from the official MCP Registry, checked by run.zero. How we check

Streamable HTTP

https://spamfixer.com/mcpResponds566 msNov 14, 2026, 14:16 UTC

No sign-in

claude mcp add --transport http email-deliverability-check https://spamfixer.com/mcp

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Settings > Connectors > Add custom connector
Name: email-deliverability-check
Remote MCP server URL: https://spamfixer.com/mcp

{
  "mcpServers": {
    "email-deliverability-check": {
      "url": "https://spamfixer.com/mcp"
    }
  }
}

code --add-mcp '{"name":"email-deliverability-check","type":"http","url":"https://spamfixer.com/mcp"}'

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1 tools

Tools of SpamFixer Email Deliverability Check
	Description		Read-only	Idempotent	Open world
`check_email_deliverability`Check why emails from a domain might land in spam. Looks up the domain's public DNS: SPF, DKIM (common selectors), DMARC, MX, and whether its mail servers are on major blocklists. Returns a 0-100 score and plain-English issues, worst first. Read-only: it changes nothing and sends no email. DKIM keys on custom selectors can't be found from outside, so "DKIM not found" is only a hint. Free email providers (gmail.com etc.) aren't checked. Args: domain: The domain that sends the email, e.g. "joesplumbing.com". A website URL or an email address also works; the domain is taken from it.	Check why emails from a domain might land in spam. Looks up the domain's public DNS: SPF, DKIM (common selectors), DMARC, MX, and whether its mail servers are on major blocklists. Returns a 0-100 score and plain-English issues, worst first. Read-only: it changes nothing and sends no email. DKIM keys on custom selectors can't be found from outside, so "DKIM not found" is only a hint. Free email providers (gmail.com etc.) aren't checked. Args: domain: The domain that sends the email, e.g. "joesplumbing.com". A website URL or an email address also works; the domain is taken from it.	No	Yes	Yes	Yes

Registry status: Active
Published: Oct 28, 2026
Updated: Oct 28, 2026
Website: https://spamfixer.com/connector⁠ (opens in a new tab)
Repository: Not given
Categories (suggested): SecuritySuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared