# Send Emails

Send Emails resources of the Mailjet Email API.

## Send an email message via Send API v3.1

 - [POST /v3.1/send](https://dev.mailjet.com/openapi/openapi-mailjet/send-emails/postsendv31.md): Send API v3.1 is built mainly for reliability, providing very detailed information in case of sending errors. This results in a lower sending limit, however - Send API v3.1 allows you to send up to 50 messages in a single API call, as opposed to v3, where the limit is 100 messages per call.

Additionally, Send API v3.1 includes a Sandbox mode. When enabled, the API will perform all the required validations and return success or error messages, but the message will not be sent.

## Send an email message via Send API v3

 - [POST /v3/send](https://dev.mailjet.com/openapi/openapi-mailjet/send-emails/postsendv3.md): Send a message via Send API v3. Send API v3 is built mainly for speed, allowing you to send up to 100 messages in a single API call, as opposed to v3.1, where the limit is 50 messages per call. However, it lacks some of the more complex functionalities of Send API v3.1 like detailed feedback information in case of sending errors.