Send message
Sends an email to a recipient using a template of the account. The send is asynchronous: the API responds 202 Accepted immediately with a message_id; the events (SENT, DELIVERED, BOUNCED, OPENED, CLICKED…) are notified later through the webhook, correlated by that message_id.
Authentication
Account authentication key. The App-Key must have the Email channel enabled and a sender (mailing output) linked; it cannot be used against the endpoints of other channels.
OAuth 2.0 access token issued by POST /api/oauth/token (client-credentials). Takes precedence over x-api-key when both are sent. See the Authentication section.
Request
Id of an active GENERAL template of the account.
Subject of the email. It is used as is (no variables).
Values for the template placeholders. Keys are the variable names (without braces); values can be strings (up to 10,000 characters), numbers or booleans, and are HTML-escaped.

