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POST
/
marketing
/
transactional
/
2026-03
/
single-email
/
send
cURL
curl --request POST \
  --url https://api.hubapi.com/marketing/transactional/2026-03/single-email/send \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "contactProperties": {},
  "customProperties": {},
  "emailId": 123,
  "message": {
    "bcc": [
      "<string>"
    ],
    "cc": [
      "<string>"
    ],
    "replyTo": [
      "<string>"
    ],
    "from": "<string>",
    "sendId": "<string>",
    "to": "<string>"
  }
}
'
{
  "status": "CANCELED",
  "statusId": "<string>",
  "completedAt": "2023-11-07T05:31:56Z",
  "eventId": {
    "created": "2023-11-07T05:31:56Z",
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  },
  "message": "<string>",
  "requestedAt": "2023-11-07T05:31:56Z",
  "sendResult": "ADDRESS_LIST_BOMBED",
  "startedAt": "2023-11-07T05:31:56Z"
}

Supported products

Authorizations

​
Authorization
string
header
required

The access token received from the authorization server in the OAuth 2.0 flow.

Body

application/json
​
contactProperties
object
required

The contactProperties field is a map of contact property values. Each contact property value contains a name and value property. Each property will get set on the contact record and will be visible in the template under {{ contact.NAME }}. Use these properties when you want to set a contact property while you’re sending the email. For example, when sending a reciept you may want to set a last_paid_date property, as the sending of the receipt will have information about the last payment.

​
customProperties
object
required

The customProperties field is a map of property values. Each property value contains a name and value property. Each property will be visible in the template under {{ custom.NAME }}. Note: Custom properties do not currently support arrays. To provide a listing in an email, one workaround is to build an HTML list (either with tables or ul) and specify it as a custom property.

​
emailId
integer<int64>
required

The content ID for the transactional email, which can be found in email tool UI.

​
message
object
required

Response

successful operation

​
status
enum<string>
required

Status of the send request.

Available options:
CANCELED,
COMPLETE,
PENDING,
PROCESSING
​
statusId
string
required

Identifier used to query the status of the send.

​
completedAt
string<date-time>

Time when the send was completed.

​
eventId
object
​
message
string
​
requestedAt
string<date-time>

Time when the send was requested.

​
sendResult
enum<string>

Result of the send.

Available options:
ADDRESS_LIST_BOMBED,
ADDRESS_ONLY_ACCEPTED_ON_PROD,
ADDRESS_OPTED_OUT,
ATTACHMENT_DOWNLOAD_QUEUE_FULL,
BLOCKED_ADDRESS,
BLOCKED_DOMAIN,
BRAND_RECIPIENT_FATIGUE_SUPPRESSED,
CAMPAIGN_CANCELLED,
CANCELLED_ABUSE,
CORRUPT_INPUT,
EMAIL_DISABLED,
EMAIL_UNCONFIRMED,
GDPR_DOI_ENABLED,
GRAYMAIL_SUPPRESSED,
HUBL_LIMIT_EXCEEDED,
IDEMPOTENT_FAIL,
IDEMPOTENT_IGNORE,
INVALID_APP_ID_ATTRIBUTION,
INVALID_FROM_ADDRESS,
INVALID_TO_ADDRESS,
LOW_CONTACT_QUALITY_SCORE,
MISSING_CONTENT,
MISSING_REQUIRED_PARAMETER,
MISSING_TEMPLATE_PROPERTIES,
MTA_IGNORE,
NON_MARKETABLE_CONTACT,
PORTAL_AUTHENTICATION_FAILURE,
PORTAL_EXPIRED,
PORTAL_MISSING_MARKETING_SCOPE,
PORTAL_NOT_AUTHORIZED_FOR_APPLICATION,
PORTAL_OVER_LIMIT,
PORTAL_SUSPENDED,
PREVIOUS_SPAM,
PREVIOUSLY_BOUNCED,
PREVIOUSLY_UNSUBSCRIBED_BRAND,
PREVIOUSLY_UNSUBSCRIBED_BUSINESS_UNIT,
PREVIOUSLY_UNSUBSCRIBED_MESSAGE,
PREVIOUSLY_UNSUBSCRIBED_PORTAL,
QUARANTINED_ADDRESS,
QUEUED,
RECIPIENT_FATIGUE_SUPPRESSED,
SENT,
TEMPLATE_RENDER_EXCEPTION,
THROTTLED,
TOO_MANY_RECIPIENTS,
UBB_GOVERNANCE_MISSING,
UNCONFIGURED_SENDING_DOMAIN,
UNDELIVERABLE,
VALIDATION_FAILED
​
startedAt
string<date-time>

Time when the send began processing.

Last modified on March 30, 2026