Registered Email API helps companies comply with the GDPR and digitize private document flows in a secure and easy way. Registered Email also provides an enhanced proof of delivery in compliance with EU 910/2014 regulation (eIDAS). Using this sending method provides you with a legal certainty and is easy to integrate into your existing process. When the Registered Email service goes into operation, our partner creates an environment created for you. If you want to add more functionality to your environment (for example, custom branding, digital signing, and/or large file transfer etc.) [contact us](https://https://developer.rabobank.com/contact?catalog=db57c2a5-5176-4676-96c2-083bc22112be). This API allows to send Registered Emails, further email related actions should be performed using the **Aangetekend Mailen** dashboard provided by our partner. ## **Before you begin** Make sure you have a working sandbox account in the [Rabobank developer portal](https://developer.rabobank.nl/). Read [Get Started](https://developer.rabobank.nl/get-started) to set up an account and register an **Application**. **Note:** To use these API(s), a valid [TLS](https://developer.rabobank.nl/how-use-mutual-tls) certificate is required.
## **Using the API** After your account set up is complete, subscribe the **Registered Email API** to your application.

## **Requests** You can initiate sending a Registered Email with POST /api/v2.0/mail/send.

POST https://api-sandbox.rabobank.nl/openapi/sandbox/api/v2.0/mail/send

To view full list of POST parameters, go to: - POST /mail/send
## **Response** After receiving the email, an ID is returned in the response.
``` { "id": "16" } ```
## **Test in Sandbox** Use the following example body for Sandbox. You need to fill in the recipients email and you can replace the values with your own information.

{"content":{"html":"Please approve our new logo: ","text":"Please approve the attached new logo.","inline":[{"cid":"newlogo","content":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAADElEQVQIW2Pg/8IPAAIoAROapGHUAAAAAElFTkSuQmCC"}]},"flow":"announcement","recipients":[{"email":"REPLACE BY YOUR EMAIL ID","language_code":"en","roles":["recipient"]}],"sender":{"display_name":"Sender","email":"sender@example.com","language_code":"en"},"subject":"Logo approval","reply_to":{"email":"questions@example.com","name":"Question Department"},"attachments":[{"name":"Logo Approval Form.png","content":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAADElEQVQIW2Pg/8IPAAIoAROapGHUAAAAAElFTkSuQmCC"}]}

## **Error** If one of the mandatory parameter value(s) is missing, you receive the following error:
``` { "error": "Missing field: recipients" } ```