The request names SuperMailOS, which is a business email inbox product that puts every domain you own into one inbox with free aliases and shared mailboxes 1. Its page lists an MCP server door only in the source metadata and shows no read actions, so it is listed first, with alternatives that are sending APIs rather than inboxes.
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SuperMailOSsupermailos.comwebsite read, tools not yet checked
Business email inbox that brings every domain you own into one login, with unlimited free aliases, shared mailboxes, snooze and filters 1.
official:MCP server · SuperMailOS
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Mailtrap Email APImailtrap.iofound in code, not yet checked
Sends transactional and batch emails and reports delivery, bounce and open statistics through its Email API 2.
+1 community tools built for it
for agents: send-email · get-sending-stats · batch-send-transactional-email
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Sources
- 1SuperMailOS — every domain you own, one beautiful inboxsupermailos.com · read 2026-10-29
- 2Mailtrap: Modern Email Delivery for dev and product teamsmailtrap.io · read 2026-10-29
- 5Resend · Email for developersresend.com · read 2026-10-29
- 6Sendmux - The Email API for AI Agents, with Inboxessendmux.ai · read 2026-10-29
- 15resend: declares "resend" (the record we read and signed)unfragile.ai · read 2026-10-24
- 16Sendmux A2A: declares "Sending" (the record we read and signed)unfragile.ai · read 2026-10-24
For agents: the 10 actions behind this answer
· SuperMailOS website read, tools not yet checked
Business email for people who run more than one thing. Every domain in one inbox, free aliases on all of them, deliverability handled. From $3 a mailbox.
send-email · MCP Mailtrap Server found in code, not yet checked
Send an email to your recipient email address using Mailtrap Email API. You can send emails to multiple recipients at once.
send_email · Mailgun (Activepieces) verified and signed
Send Email — Send an email using your Mailgun domain
send_email · Mailjet (Activepieces) verified and signed
Send Email — Send a text, HTML or template email through Mailjet
resend · resend verified and signed
Use when working with the Resend email API — sending transactional emails (single or batch), receiving inbound emails via webhooks, managing email templates, tracking delivery events, managing domains, contacts, broadcasts, webhooks, API keys, inboxes (threads, labels, drafts, replies), automations,
Sending · Sendmux A2A verified and signed
Send email and manage outbound attachments through Sendmux sending routes.
· Mailkite website read, tools not yet checked
Receive any message as a webhook, send with one API across unlimited domains and mailboxes, free. No mail server, no MX/SPF/DKIM/DMARC to rebuild for every launch. The email platform for developers, teams, and the agents they build.
send-email · Sidemail MCP Server found in code, not yet checked
Send a transactional email (Sidemail API). This tools can only be used for sending transactional emails, not marketing emails (for that, use the Messenger tool).
· Dovemails website read, tools not yet checked
Dovemails is a hosted email platform: one API for transactional mail, plus broadcasts, automations and contact lists for marketing. Drop-in endpoints for Postmark, Mailgun and Resend, SMTP on 587, signed webhooks, and delivery from our own mail servers.
sendEmail · Maileroo (Activepieces) verified and signed
Send Email — Sends an email using the Maileroo API.
Labels are the instruments' verdict and are never changed by ranking. Agents and robots get this same answer as JSON at /api/v1/find?q=…&answer=1 and through the MCP server.