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Documentation

Product docs for developers and marketers. Clear specs, fast paths, no fluff.

Quick links:Send an email (API)•Download sample CSV•Connect your domain•Receive inbound emails•Open & bounce webhooks•Generate DNS records (API)•How emails are counted•Generate API tokens

Email API

Send and reply to transactional emails via multipart requests with JSON payload + optional attachments. Returns 202 Accepted.

RESTMultipartTransactional

Open POST /api/v1/emails Errors

CSV Import

Upload UTF-8 CSVs with a header row to add contacts to a Group. Invalid rows skipped; import stops at your plan quota.

ContactsCSVImport

Open Headers Sample CSV

Domain Setup

Authenticate your domain (SPF, DKIM, DMARC) and add up to 10 sender emails per domain.

DNSSPF/DKIM/DMARCSenders

Open Sender limit Verify

Inbound Emails & Webhooks

Receive emails sent to your domain as JSON POSTs. Set MX, enable inbound, manage webhooks via API, handle attachments via authenticated S3 URLs, and inspect every delivery.

WebhooksInboundAttachmentsMX

Open MX record Payload Attachments

Event Webhooks

Get a signed JSON POST when your transactional emails are opened or bounce. Subscribe events, verify the HMAC signature, and read the exact payload we return.

WebhooksOpenBounceSigned

Open Events Payload Signature

Transactional Email Counting

How Email API sends are metered toward your plan: per recipient (to only), excluding cc/bcc and replies, within a rolling monthly billing window.

BillingUsageTransactional

Open Counting unit Billing window

Domain API

Provision a sender domain via the public API. Generate SPF/DKIM/DMARC records and optionally enable inbound in one call.

RESTDNSProvisioning

Open POST /api/v1/emails/domains/generate Errors

Need help?

Questions or edge-cases? Email support@sendtrim.com.

Open Email API Open CSV Import Open Domain Setup