Send and receive email from @yourcompany.com in minutes. Verify your domain with SPF, DKIM & DMARC, grab SMTP credentials or an API key, and ship.
curl https://smtp.relaymx.io/api/send \
-H "X-API-Key: rmx_live_••••" \
-H "Content-Type: application/json" \
-d '{
"from_addr": "you@yourcompany.com",
"to": ["user@example.com"],
"subject": "Welcome aboard",
"html": "<h1>Hello 👋</h1>"
}'Built for engineering teams who want deliverability without running Postfix at 3am.
Add any domain and get copy-paste SPF, DKIM and DMARC records with live verification.
Plug credentials into any app or fire a single HTTPS request. Whatever fits your stack.
Every message is signed with a 2048-bit DKIM key generated per domain. Inbox, not spam.
Receive replies on your domain and read them right inside the dashboard.
Searchable, filterable logs with SMTP responses and full payload inspection.
Issue and revoke keys per app. Rotate instantly without touching your domain.
Enter mail.yourcompany.com and we generate your DKIM key.
Copy SPF, DKIM, DMARC to your DNS provider.
One click checks your records and flips you to verified.
Use SMTP creds or an API key and start delivering.
For side projects
For growing teams
Dedicated IP & SLA