"Free and open-source GPS without an API" matching MCP connectors:
Matching Connector Tools:
Scan and fix email auth (SPF, DMARC, DKIM, MX, blacklists, expiry) + DNS checks. Validated fixes.
Read-only Amazon SES observability: search events, inspect bounces, pull delivery stats.
Teaches AI to write HTML email that renders in Outlook, Gmail, and Apple Mail. 19 rules, 6 comps.
7 sales-outreach persona and skill products plus deliverability tooling over MCP: audit_copy scores email copy out of 100 for spam triggers and personalization, sequence_planner builds opt-out-respecting cadences, subject_line_scorer ranks up to 20 lines, utm_builder produces tracking URLs, and get_free_skill loads any product's complete free gateway skill.
Coldrig — cold-email infra run by your agent: 28 MCP tools, live sending, free sandbox. $99/mo.
Read your AI-written daily briefing and retune the filter behind it: feeds, newsletters, topics.
Manage Subscribers, Broadcasts, Sequences, Automations, and reporting in Mailrith.
AI invoice follow-up emails for freelancers. Draft-only, never sends for you.
DNS and email security scanner with 80 MCP tools for SPF, DMARC, DNSSEC, SSL, and brand audits.
Let ChatGPT, Claude & Cursor use your Mac: email, calendar, iMessage, Teams, files. Local, free.
Verify email addresses and clean lists to improve deliverability and sender reputation.
Email OS for agents - real-inbox search, triage, commitments, and a verifiable BEC hard-stop.
Capture receipts, scan Gmail, analyze spending, and create reviewed reports from AI assistants.
Give an agent its own inbox: send, receive, and pull signup codes from real email.
Keyless email checks: disposable, role, and free-provider detection, MX, and typo suggestions.
Free SPF, DKIM, DMARC, MX deliverability check with graded shareable reports, plus referral terms
Emailable MCP — wraps the Emailable email verification API (emailable.com)
MCP server for Tomba email finder, verification, and contact enrichment API
could-have-been-email MCP — wraps StupidAPIs (requires X-API-Key)