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MCP Server

ARC-Relay

com.arc-relay/mcp
Communication Security Public & reachable MCP 2026-07-28

What this MCP does

Checks email-domain DMARC, SPF, MX, and DKIM health and provides relay-network status and reputation information.

Capabilities

Tools

6 tools
check_dmarc
Check a domain's DMARC, SPF, and MX records. Use this to diagnose email authentication issues.
Input schema 
{'type': 'object', 'required': ['domain'], 'properties': {'domain': {'type': 'string', 'description': 'Domain name to check (e.g. example.com)'}}}
check_email_health
Get a 0-100 email health score for any domain. Checks DMARC, SPF, MX, and DKIM records and returns a letter grade (A+ to F) with actionable recommendations. Use this to audit any domain's email security posture.
Input schema 
{'type': 'object', 'required': ['domain'], 'properties': {'domain': {'type': 'string', 'description': 'Domain name to score (e.g. example.com)'}}}
check_health
Check ARC-Relay service health and uptime.
Input schema 
{'type': 'object', 'properties': {}}
check_spf
Validate a domain's SPF record. Shows mechanisms, DNS lookup count, and warns if over the 10-lookup limit.
Input schema 
{'type': 'object', 'required': ['domain'], 'properties': {'domain': {'type': 'string', 'description': 'Domain name to validate (e.g. example.com)'}}}
network_leaderboard
View top relay nodes ranked by reputation score. Filter by region.
Input schema 
{'type': 'object', 'properties': {'limit': {'type': 'number', 'description': 'Max results (1-100, default 25)'}, 'region': {'type': 'string', 'description': 'Filter by region (e.g. us-west, eu-central)'}}}
network_stats
Get public relay network statistics — total nodes, active nodes, messages routed, delivery rate, DMARC pass rate.
Input schema 
{'type': 'object', 'properties': {}}
History

Recent tool changes

Added
network_stats
Sept. 17, 2026, 12:33 p.m.
Added
network_leaderboard
Sept. 17, 2026, 12:33 p.m.
Added
check_spf
Sept. 17, 2026, 12:33 p.m.
Added
check_health
Sept. 17, 2026, 12:33 p.m.
Added
check_email_health
Sept. 17, 2026, 12:33 p.m.
Added
check_dmarc
Sept. 17, 2026, 12:33 p.m.
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