Send transactional emails via API or SMTP relay. Built-in DKIM signing, open & click tracking, suppression management, and multi-IP rotation.
Send via our simple JSON API or configure any email client as an SMTP relay. Full support for Thunderbird, Outlook, and custom apps.
Every outbound email is automatically DKIM-signed using a 1024-bit key tied to your sending domain. Improves deliverability out of the box.
Track when recipients open emails and click links. Per-email event history with timestamps. Track pixels and redirect links are auto-injected.
Global suppression list prevents sending to bounced or unsubscribed addresses. One-click unsubscribe headers included automatically.
Distribute sending volume across multiple IPs with round-robin rotation. Dedicated IPs with separate PTR records for each sending identity.
Verify your sending domains with SPF, DKIM, and DMARC. Real-time DNS checks ensure you're always compliant before sending.
# Send an email via API curl -X POST https://api.beyondsmtp.com/api/send \ -H "X-API-Key: your_api_key" \ -H "Content-Type: application/json" \ -d '{ "to": "user@example.com", "from": "hello@yourdomain.com", "fromName": "Your App", "subject": "Welcome!", "html": "<h1>Hello!</h1><p>Welcome to our app.</p>" }' # Response { "status": "queued", "jobId": "f3a2...b9c1" }
Need higher volume? Contact us for a custom plan.
Full email authentication stack for every domain
Forward-confirmed reverse DNS on all sending IPs
Unsubscribe headers and suppression lists built-in
Bounce and complaint tracking with automatic suppression
Strict AUP — no spam, no phishing, no bulk unsolicited mail
Create a free account, add a sending domain, set up your DNS records (SPF, DKIM, DMARC), and generate an API key. You can send your first email in under 10 minutes.
Yes. Configure any email client or application to use mail.beyondsmtp.com:587 with STARTTLS and your SMTP credentials. Works with Thunderbird, Outlook, Sendmail, and any SMTP-compatible application.
BeyondSMTP is designed for transactional email — password resets, order confirmations, notifications, and account emails. Marketing campaigns are not supported.
When you add a domain, we generate a DKIM keypair. You add the public key as a TXT record on your domain. All outbound emails from that domain are automatically signed.
Bounced addresses are automatically added to the global suppression list. Subsequent sends to those addresses are blocked, protecting your sender reputation.