inboxguard

https://mcp.inboxguard.io/mcp

answers a handshake

Registry name: io.inboxguard/email-deliverability
Reports itself as: inboxguard 1.6.0
Protocol version: 2025-06-18
Transport: streamable-http
HTTP status: 200
Latency: 287 ms
Tools: 28
Checked: 2026-09-06T08:27:20Z

Tools it reports

scan_domain
get_deliverability_score
check_blocklists
get_dmarc_summary
list_domains
get_domain
list_alerts
list_scans
resolve_alert
get_dns_fix_plan
apply_dns_fix
analyze_headers
scan_domains_batch
get_scan_job
remove_domain
list_registrar_connections
create_notification_channel
create_share_link
connect_snds
get_snds_status
get_snds_ip_stats
connect_inbox_placement
get_inbox_placement_status
start_inbox_placement_test
get_inbox_placement_test
list_inbox_placement_tests
get_deliverability_report
get_portfolio

Check it yourself

curl -s -X POST https://mcp.inboxguard.io/mcp \
  -H 'Content-Type: application/json' \
  -H 'Accept: application/json, text/event-stream' \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"you","version":"0"}}}'