attachments as an array. Each file needs a filename and its content base64-encoded; contentType and contentId are optional.
Fields
string
required
Shown to the recipient. Up to 255 characters; path separators are refused.
string
required
The file, base64-encoded (standard alphabet; line breaks are tolerated).
string
default:"application/octet-stream"
The MIME type, for example
application/pdf or image/png. Set it so mail clients open the file correctly.string
Makes the file an inline part. Reference it from the HTML as
<img src="cid:logo">. Letters, digits, ., _, @ and -.Limits
- 10 files per email.
- 3 MB decoded in total per email. Over that the request is a
413 payload_too_largeand nothing is queued. For larger files, link to a download. - Files are stored encrypted for 30 days, the same window as message bodies, then deleted.
- The message object lists each attachment’s
filename,contentTypeandsize, never the bytes.