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io.github.spruikco/send16-mcp
io.github.spruikco/send16-mcp in the official MCP registry.
Endpoint https://mcp.send16.com/mcp. Source: github.com/spruikco/send16-mcp.
The registry describes it as: Email for AI agents: send mail, manage contacts, automations & webhooks. Zero-DNS first send.
We read its 87 tools on 2026-10-27. Nothing in them matched our tool-poisoning rules.
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
whoami send_email send_campaign_test create_campaign design_email_template list_campaigns create_contact search_contacts list_contacts import_contacts list_domains check_domain_health get_campaign_stats get_deliverability_status list_automations get_automation enroll_in_automation send_event list_templates save_template list_workspace_templates send_template_test get_template render_email_content add_domain pre_send_review generate_email_from_url list_messages get_message get_message_events list_convos get_convo send_reply mark_convo_read update_convo add_convo_note screener_decide list_inbox_counts list_topics create_topic update_topic delete_topic list_actions get_action create_action update_action delete_action list_audiences create_audience add_contacts_to_audience remove_contact_from_audience delete_audience list_segments preview_segment list_events get_event_insights list_event_registrations register_for_event check_in_attendee update_contact and 27 more
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The badge reflects the latest weekly read: 
[](https://lazaretto.dev/mcp-registry/io-github-spruikco-send16-mcp)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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