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io.inboxguard/email-deliverability
io.inboxguard/email-deliverability in the official MCP registry.
Endpoint https://mcp.inboxguard.io/mcp.
The registry describes it as: Scan and fix a domain's email deliverability (SPF, DKIM, DMARC, MTA-STS, BIMI, DNS blocklists).
We read its 28 tools on 2026-10-22. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
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
Run this server? Show the check in your README
The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/io-inboxguard-email-deliverability)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.
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