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Authorizations

Authorization
string
header
required

Bearer authentication header of the form Bearer <token>, where <token> is your auth token.

Headers

Idempotency-Key
string

Completed responses replay for 24 hours. Unknown handoffs remain reserved until reconciliation; never retry with a new key.

Required string length: 1 - 256

Body

application/json
from
string
required
to
required
subject
string
required

At most 998 UTF-8 bytes, no line breaks

cc
bcc
reply_to
text
string
html
string
headers
object
tags
object[]
Maximum array length: 50
attachments
object[]

At most 2 MiB decoded; no URL/path attachments

Maximum array length: 10
scheduled_at
string<date-time>

Response

Successful operation

id
string
required
Pattern: ^[1-9][0-9]{0,18}$