01
Send transactional email
Trigger password resets, OTPs, magic links, receipts, confirmations, account alerts, and product notifications through REST, SDKs, or SMTP relay.
Email API for developers
One API surface for product email: transactional sending, SMTP relay, inbound webhooks, suppressions, domain authentication, delivery events, and privacy-focused aliases with EU/EEA-hosted primary service data.
Need provider-level comparison? Review Postscale as an EU transactional email provider for product teams.
Everything the product needs. Nothing it does not.
A focused API surface with production controls, predictable resources, and the operational visibility to run email confidently.
02
Receive email as webhooks
Point MX records at Postscale and receive parsed inbound messages, headers, bodies, attachments, and sender metadata as signed JSON webhooks.
03
Use SMTP where it fits
Move Rails, Django, Laravel, WordPress, PHP, and legacy systems by swapping SMTP host and credentials instead of rewriting send code.
04
Keep suppressions close to sending
Hard bounces, complaints, unsubscribes, and manual blocks are checked before sending so known-bad recipients do not keep damaging reputation.
05
Add privacy aliases
Create masked addresses for signup flows, marketplaces, feedback tools, and support workflows where users should not expose their real inbox.
06
Monitor deliverability
Track delivered, bounced, deferred, and complained events, import provider suppressions, review DMARC reports, and ramp new senders deliberately.
Start with one request.
The public API uses explicit resources and familiar JSON. Move from a first request to production without changing integration models.
Read API docsNode.js: send through the email API ready
await fetch("https://api.postscale.io/v1/send", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.POSTSCALE_API_KEY}`,
"Content-Type": "application/json",
},
body: JSON.stringify({
from: "Acme <hello@acme.example>",
to: ["user@example.com"],
subject: "Confirm your account",
html_body: "<p>Your verification code is 482193.</p>",
text_body: "Your verification code is 482193.",
tags: ["verification"]
}),
});Further reading
01
Transactional Email API
The dedicated sending page for password resets, OTPs, receipts, confirmations, alerts, and product notifications.
Read more02
SMTP relay
Use SMTP relay when an existing app, framework, CMS, or legacy system already sends mail through SMTP.
Read more03
Inbound Email API
Receive email as signed parsed webhooks for support inboxes, reply handling, and email-driven workflows.
Read more04
Privacy-focused email infrastructure
How Postscale combines EU/EEA-hosted primary service data, masked aliases, suppressions, DMARC reports, and clear GDPR documentation.
Read more05
Amazon SES alternative
Compare Postscale with SES when raw sending cost is not the only buying criterion.
Read more06
Email API migration guide
Plan endpoint mapping, webhook migration, suppression imports, DNS changes, and staged cutover.
Read moreFrequently asked questions
What is an email API?
An email API lets your application send or receive email through HTTP, SDKs, SMTP credentials, and webhooks instead of operating mail servers directly.
Can I use the API and SMTP relay together?
Yes. REST sends and SMTP-originated sends share the same verified domains, logs, suppressions, and webhook event pipeline.
Is this for marketing campaigns?
No. Postscale focuses on transactional and product email workflows: verification, password reset, receipts, account alerts, inbound replies, masked aliases, and app notifications.
What counts toward usage?
Outbound usage counts per accepted recipient, including To, Cc, and Bcc. Accepted inbound messages count toward the same monthly quota.
Build the email workflow your product needs.
The free tier includes everything required to evaluate the API. No credit card required.
Create a free account