"Free APIs and services without commercial fees" matching MCP connectors:
Matching Connector Tools:
Test-inbox API for email and SMS: create inboxes, long-poll messages, extract OTPs and links.
Email for AI agents: read, search, send, organize, and schedule across your inboxes.
Your unified inbox — everything that reaches you, understood and actionable from your AI assistant.
Teaches AI to write HTML email that renders in Outlook, Gmail, and Apple Mail. 19 rules, 6 comps.
Agent-run cold-email infra: 21 MCP tools, live sending, free sandbox. $99/mo, concierge go-live.
Let ChatGPT, Claude & Cursor use your Mac: email, calendar, iMessage, Teams, files. Local, free.
DNS and email security scanner with 80 MCP tools for SPF, DMARC, DNSSEC, SSL, and brand audits.
Keyless email checks: disposable, role, and free-provider detection, MX, and typo suggestions.
Cameron Rye's blog, projects, resume, and live site stats, plus contact and newsletter tools.
PDF, photo, email, and file comparison evidence checks with plain-language reports.
Email OS for agents - real-inbox search, triage, commitments, and a verifiable BEC hard-stop.
Hosted email for AI agents: create inboxes, send, receive, and reply over MCP with scoped API keys
Manage lists, contacts and campaigns, and read campaign performance reports on EmailOctopus.
Read email/chat conversations, messages, contacts and teams; draft, send and update threads.
Send email and read templates, marketing contacts, lists, stats, bounces and unsubscribes.
MCP server for Nylas — read email, calendars, events and contacts, and send email or create events.
Verify emails — deliverability, disposable/role/free detection, MX validity, domain age.
Scan and fix a domain's email deliverability (SPF, DKIM, DMARC, MTA-STS, BIMI, DNS blocklists).
Email infrastructure for AI agents — send, receive, search, and reply to email over MCP.