Send receipts, sign-in links and notifications from your own domain with a REST API that takes the same requests as Resend. Webhooks, receiving, batches and scheduling come with the free API plan of 3,000 emails a month, and the $10 Developer plan raises that to 50,000.
curl -X POST https://api.wsmailpro.com/v1/emails \
-H "Authorization: Bearer $WSMAIL_API_KEY" \
-H "Content-Type: application/json" \
-H "Idempotency-Key: receipt-1234" \
-d '{
"from": "Acme <orders@acme.com>",
"to": ["jane@example.com"],
"subject": "Your receipt",
"html": "<p>Thanks for your order.</p>"
}'The response is { "id": "…" }. Follow the message with GET /v1/emails/{id} or a webhook. Keys are created in the developer dashboard.
Transactional email from any address on a verified domain, DKIM-signed by our own mail servers, with per-recipient delivery status.
Delivered, bounced, complained, failed and received events, signed with the Standard Webhooks scheme that Resend and svix libraries already verify.
Mail to addresses on your domain arrives as a webhook, with the text, HTML, headers, attachments and original message available over the API.
Up to 100 emails in one call, or a send time up to 30 days ahead that you can move or cancel.
An Idempotency-Key makes a retried request return the first result instead of sending twice.
Send from onboarding@wsmailpro.com to your own address before your domain is verified, and to a sink address that accepts and discards mail for CI.
Suppression of bounced and complaining addresses, a sandbox for new accounts, and review of sudden spikes, so one bad list cannot damage your domain.
An OpenAPI 3.1 document for Postman and client generators, and a ready-made brief for AI coding assistants.
Most sending APIs are a separate product from the mailboxes your team reads. You verify the domain twice, watch two dashboards, and replies to your transactional mail land somewhere the sending service cannot see. Here the API runs on the same account and domains as your team’s email, so the domain is verified once and replies and inbound mail can come back through the same API.
The request shape deliberately matches Resend’s: the same field names, the same error envelope, the same Idempotency-Key header and batch endpoint, and webhook signatures that their libraries verify. Moving an existing integration is usually a change of base URL and key. The migration guide lists what is and is not supported.
Deliverability is a shared resource, so until your domain is verified you can send only from onboarding@wsmailpro.com to your own address. Once it is verified you can send to anyone, with an hourly cap for new senders that lifts after two weeks of clean sending. Bounced and complaining addresses are suppressed automatically, links to blocklisted domains are refused, and a sudden spike is held for a person to review rather than sent. That is how the established providers keep their IPs clean, and it is why your mail keeps landing in the inbox.
A Node SDK and an SMTP gateway for apps that only speak SMTP are rolling out; until then, any HTTP client works.
The request and error shapes match: the same fields for from, to, cc, bcc, subject, html, text, attachments, tags and scheduled_at, the same Idempotency-Key header and batch endpoint, and webhook signatures that Resend and svix libraries verify. Most integrations move over by changing the base URL and the key. Audiences, contacts and stored templates are not offered.
The email API has its own plans, separate from your mailbox plan. The free API plan includes 3,000 emails a month (at most 100 a day), one sending domain and one webhook endpoint. The Developer plan is $10 a month per organization, billed separately from any mail plan, for 50,000 emails a month with no daily limit, 10 domains, 5 webhook endpoints and 150 AI requests a month. Cancel any time.
To protect the sending reputation every customer shares. Until you verify a domain, you can send only from onboarding@wsmailpro.com to your own account’s email address, so you can try the API straight away. Once a domain is verified you can send from it to anyone, with an hourly cap for new senders that lifts after 14 days and 200 sends with few bounces.
Yes. Turn on receiving for a verified domain and mail to any address there without a mailbox arrives as an email.received webhook. The text, HTML, headers, attachments and the original message are available over the API.
Create a free account, make a key and send from onboarding@wsmailpro.com to yourself right away. Verify your domain to send to anyone.
Create your free accountNo credit card. No trial clock.