This article provides step-by-step setup instructions to get started to use the API endpoints and send emails to your users.

If you use PHP, you can install our library – Sendios-SDK.

Before sending emails, you need to do the following:

  1. Configure Sender and Tracking Domains;
  2. Configure SPF/DKIM records according to Sender Domain Settings;
  3. Create a Project;
  4. Create a template;
  5. Create a transactional email.

All API points work asynchronously. If you get a 200 OK response, we received and processed your request, which was validated. To find out the email sending status, go to the admin panel to the User profile or Webhooks. sections.

Authorization is required to make requests to the server. The following steps should be performed:

  1. Request clientId and API key from your Customer Success Manager;
  2. Encode the string {clientId}:{api_key} in base64;
  3. Enter the received coded string into the authorization header.
clientIdClient identifier
api_keyAPI key
curl -X GET \
-u {clientId}:{api_key}

If you use our Sendios SDK library, you must request the clientId and SDK key from the Customer Success Manager.


Currently, only the PHP SDK is supported, and other programming languages are unavailable.

You can find out about the system's status on the website there, in case of any incidents or system unavailability, we notify about problems and publish actual information. More options for monitoring can be found in the article Sendios Monitoring.