About Sendtier
Sendtier is a transactional email API for developers. It is operated by MB Tobuli, and today it is in public preview.
What Sendtier does
Your application sends email from your own domain with a REST call to POST https://api.sendtier.com/v1/emails. Delivery results come from the mail server's logs: delivered, delayed, bounced, failed and complained. Receiving-server replies are available when recorded, so a bounce can show the reason the receiving side gave. Webhooks send these events to your HTTPS endpoint, and each delivery carries an HMAC-SHA256 signature.
Live mail is sent by Sendtier's own MTA (KumoMTA), which runs on the OVHcloud MTA host, and there is no other live email provider. The API and dashboard run on Laravel Cloud.
Who operates Sendtier
Sendtier is operated by MB Tobuli. Guides, comparisons and blog posts on this site are published by Sendtier as an organization, without personal bylines.
Status today
Free sending allows 3 000 recipients a month, up to 100 a day. Today, live sending is subject to public preview warm-up limits. Today, Pro and Scale are planned and not on sale; see pricing. The public preview post lists what works today and what is still planned.
Try it with a test key
You can try the API without sending real mail. Create an account at app.sendtier.com, add a domain you own and create a test key. The domain's DNS records can stay pending for a test send. Test emails are never delivered and never reach the mail server. A successful send returns 202 with an em_ ID and the status queued or scheduled. Today, a 202 response means accepted, not delivered.
Tests allow 1 000 recipients per UTC day and do not use live limits. A test webhook endpoint receives only test-mode events. The quickstart walks through the first request, authentication explains test and live keys, and webhooks shows how to verify the signature.
How we write guides and comparisons
Sendtier publishes guides, comparisons, migration guides and blog posts about transactional email. Pages link their primary sources, such as RFCs and provider documentation, next to the claims they support. Statements about Sendtier come from a list of facts that is checked against the code, the API specification and tests. Every new page and every change is checked before it goes live. Comparisons also keep a section on where the other provider is the better choice. The editorial policy describes sources, checks, dates and corrections.
Contact
Write to hello@sendtier.com with questions about Sendtier or corrections to this site. Report a security issue to security@sendtier.com; the security page lists what to include.