Enhanced Outbound Sending API

Until now, all transactional messages sent through the Mailsac API only allowed text. With the latest release, the API supports HTML and attachments. Additionally supported is sending an entire raw SMTP message over the REST API.

New Transactional Email Fields

 

HTML

You can provide full HTML in the html field when doing a POST /api/outgoing-messages. This was not possible in previous versions of the API.

Attachments

Attachments can be sent and linked into the html by including an array of attachment objects in the attachments field.

Example Inline Attachment
{
  "contentDisposition": "attachment",
  "content": "3asfji32gia...93as==",
  "encoding": "base64",
  "filename": "2561a.jpg",
}
Example Attached File
{
  "cid": "F3011FGE@hsd1.ca.comcast.net.",
  "contentDisposition": "inline; filename=2561a.jpg",
  "content": "3asfji32gia...93as==",
  "encoding": "base64",
  "filename": "2561a.jpg",
}

Received Headers

Persisting received headers is now possible – send a single string or array of received headers. This allows you to receive SMTP in your application, pre-parse it, and pass along received information.

Raw SMTP over HTTP

 

If you want to test SMTP parsing or have an application that generates raw SMTP messages, put the entire SMTP contents into the raw field when doing a POST /api/outgoing-messages.

Mailsac will parse the headers, text, HTML, and attachments, then deliver it for you.

All other fields will be ignored when you send a raw message.

 

 

Read the API docs for sending transactional emails over HTTP

 

API Reference Overhaul

The API documentation received a fresh new look using a fork of the popular Slate docs framework.

new-docs-look
Significant update to our documentation

API endpoints should be easier to navigate. Many request and response examples were added. Endpoints for downloading attachments are easier to find.

In the coming weeks there will be updates to the docs for the SMTP Web Socket API and the Webhook API, including new examples and guides.

View the new API Docs