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POST
Inject a JSON message onto the same durable path as SMTP

Authorizations

Authorization
string
header
required

API key (dh_live_...) or Auth0 JWT token

Headers

Idempotency-Key
string

Replays the stored response for 24h when the same key is sent again (1–255 visible ASCII)

X-DevHelm-Client
string

Calling surface and version, e.g. cli/1.4.0 or sdk-js/2.0.0

Path Parameters

domain
string
required

Body

application/json

Inject a test email without SMTP

to
string
required

Recipient local-part or full mailbox

Minimum string length: 1
from
string
required

Sender mailbox

Minimum string length: 1
subject
string | null

Subject line

text
string | null

Plain-text body

html
string | null

HTML body

headers
object | null

Extra MIME headers as received

Response

Accepted

data
object
required

Accepted inject; wait or get after persist