Mailyond

Mailyond is an email inbox and sending service for founders and small teams running multiple products or domains. It consolidates mail from every address on every domain you own into a single inbox, color-tagged by project, so you stop logging in and out of separate accounts. Replies go out from the address the customer wrote to, staying in the same thread.

You can send transactional email from your app with one API call using a Resend-compatible endpoint. The same API key works across all your connected domains, with no second vendor or DNS setup needed. If you already use Resend, you can keep it and point the SDK at Mailyond instead, or use both services separately.

Set it up by adding three DNS records (DKIM, Return-Path and MX) per domain, then verify. Your main inbox stays where it is; you can point just support.yourdomain.com at Mailyond while you@yourdomain.com remains on Gmail. Mailyond also runs an MCP server, so AI agents like Claude or Grok can read your inbox and reply in the right thread.