Send an email

Authorizations

bearerAuth

Header Parameters

Idempotency-Key

string

>= 1 characters <= 256 characters

A unique key (1 to 256 characters) that makes the request safe to retry for 24 hours.

Example

welcome-user-4821

Request Body^required

application/json

Either html or text is required. reply_to is also accepted as replyTo and scheduled_at as scheduledAt.

object

from

required

An email address, optionally with a display name: Acme <hello@acme.com>.

string

to

required

One of:

string
Array<string>

An email address, optionally with a display name: Acme <hello@acme.com>.

string

subject

required

string

>= 1 characters <= 998 characters

cc

One of:

string
Array<string>

An email address, optionally with a display name: Acme <hello@acme.com>.

string

bcc

One of:

string
Array<string>

An email address, optionally with a display name: Acme <hello@acme.com>.

string

reply_to

One of:

string
Array<string>

An email address, optionally with a display name: Acme <hello@acme.com>.

string

html

string

text

string

headers

object

key

additional properties

string

attachments

Array<object>

<= 50 items

Provide exactly one of content or path.

object

filename

required

string

<= 255 characters

content

Base64-encoded file content.

string

path

A public URL fetched at send time.

string format: uri

content_type

string

content_id

Content-ID for inline images (cid:).

string

tags

Array<object>

<= 50 items

object

name

required

string

<= 256 characters /^[A-Za-z0-9_-]+$/

value

required

string

<= 256 characters /^[A-Za-z0-9_-]+$/

scheduled_at

ISO 8601 date-time or natural language such as “in 1 hour” or “in 2 days”. At most 30 days ahead.

string

tenant_id

Platform mode. Our tenant id or your external_id. Optional when the from domain belongs to a tenant; a conflict with the domain’s tenant is a 422.

string

>= 1 characters <= 200 characters

Examples

HTML email

{
  "from": "Acme <onboarding@acme.com>",
  "to": [
    "delivered@test.spacepost.dev"
  ],
  "subject": "Welcome to Acme",
  "html": "<p>Thanks for signing up!</p>"
}

Scheduled with tags

{
  "from": "Acme <onboarding@acme.com>",
  "to": "user@example.com",
  "subject": "Your trial ends soon",
  "text": "Your trial ends in 3 days.",
  "scheduled_at": "in 1 hour",
  "tags": [
    {
      "name": "category",
      "value": "trial"
    }
  ]
}

200

The email was accepted.

application/json

object

id

required

string format: uuid

Example

{
  "id": "0198a1c2-7b3e-7a41-9d52-5f6c1e0b8a11"
}

Headers

ratelimit-limit

integer

Requests allowed per second for your team.

ratelimit-remaining

integer

Requests left in the current one-second window.

ratelimit-reset

integer

Seconds until the window resets.

400

An error. Common statuses: 400 invalid_idempotency_key; 401 missing_api_key or restricted_api_key; 403 invalid_api_key, invalid_from_address, sending_paused (team or tenant) or invalid_access; 404 not_found; 409 invalid_idempotent_request or concurrent_idempotent_requests; 422 validation_error (also: tenant_id conflicts with the domain’s tenant; deleting a tenant that still has domains); 429 quota errors.

application/json

object

statusCode

required

integer

name

required

Machine-readable error name.

missing_api_key (401): no bearer token.
invalid_api_key (403): unknown or malformed key.
restricted_api_key (401): the key is sending_access (or limited to another domain).
validation_error (422): invalid request. Also used with 403 for plan limits and test-domain restrictions.
not_found (404): the resource does not exist or belongs to another team.
method_not_allowed (405)
invalid_idempotency_key (400): key length outside 1 to 256.
concurrent_idempotent_requests (409): the original request is still running.
invalid_idempotent_request (409): the key was used with a different payload.
rate_limit_exceeded (429)
daily_quota_exceeded (429): the sandbox, daily limit or a tenant’s daily_limit was reached.
monthly_quota_exceeded (429): the plan’s monthly limit was reached (Free plan).
invalid_from_address (403): the sender domain is not verified.
invalid_access (422; 403 when a team that is not trusted tries to unpause a tenant paused for its bounce or complaint rate)
invalid_parameter (422)
sending_paused (403): sending is paused for the team, or for the tenant named by tenant_id, after a bounce or complaint spike or a manual pause.
security_error (451)
application_error (500)
internal_server_error (500)

string

Allowed values: missing_api_key invalid_api_key restricted_api_key validation_error not_found method_not_allowed invalid_idempotency_key concurrent_idempotent_requests invalid_idempotent_request rate_limit_exceeded daily_quota_exceeded monthly_quota_exceeded invalid_from_address invalid_access invalid_parameter sending_paused security_error application_error internal_server_error

message

required

string

Examples

{
  "statusCode": 422,
  "name": "validation_error",
  "message": "`subject`: Invalid input: expected string, received undefined"
}

{
  "statusCode": 404,
  "name": "not_found",
  "message": "Email not found"
}

{
  "statusCode": 401,
  "name": "missing_api_key",
  "message": "Missing API key in the authorization header. Include `Authorization: Bearer sp_live_...`."
}

401

An error. Common statuses: 400 invalid_idempotency_key; 401 missing_api_key or restricted_api_key; 403 invalid_api_key, invalid_from_address, sending_paused (team or tenant) or invalid_access; 404 not_found; 409 invalid_idempotent_request or concurrent_idempotent_requests; 422 validation_error (also: tenant_id conflicts with the domain’s tenant; deleting a tenant that still has domains); 429 quota errors.

application/json

object

statusCode

required

integer

name

required

Machine-readable error name.

missing_api_key (401): no bearer token.
invalid_api_key (403): unknown or malformed key.
restricted_api_key (401): the key is sending_access (or limited to another domain).
validation_error (422): invalid request. Also used with 403 for plan limits and test-domain restrictions.
not_found (404): the resource does not exist or belongs to another team.
method_not_allowed (405)
invalid_idempotency_key (400): key length outside 1 to 256.
concurrent_idempotent_requests (409): the original request is still running.
invalid_idempotent_request (409): the key was used with a different payload.
rate_limit_exceeded (429)
daily_quota_exceeded (429): the sandbox, daily limit or a tenant’s daily_limit was reached.
monthly_quota_exceeded (429): the plan’s monthly limit was reached (Free plan).
invalid_from_address (403): the sender domain is not verified.
invalid_access (422; 403 when a team that is not trusted tries to unpause a tenant paused for its bounce or complaint rate)
invalid_parameter (422)
sending_paused (403): sending is paused for the team, or for the tenant named by tenant_id, after a bounce or complaint spike or a manual pause.
security_error (451)
application_error (500)
internal_server_error (500)

string

Allowed values: missing_api_key invalid_api_key restricted_api_key validation_error not_found method_not_allowed invalid_idempotency_key concurrent_idempotent_requests invalid_idempotent_request rate_limit_exceeded daily_quota_exceeded monthly_quota_exceeded invalid_from_address invalid_access invalid_parameter sending_paused security_error application_error internal_server_error

message

required

string

Examples

{
  "statusCode": 422,
  "name": "validation_error",
  "message": "`subject`: Invalid input: expected string, received undefined"
}

{
  "statusCode": 404,
  "name": "not_found",
  "message": "Email not found"
}

{
  "statusCode": 401,
  "name": "missing_api_key",
  "message": "Missing API key in the authorization header. Include `Authorization: Bearer sp_live_...`."
}

403

An error. Common statuses: 400 invalid_idempotency_key; 401 missing_api_key or restricted_api_key; 403 invalid_api_key, invalid_from_address, sending_paused (team or tenant) or invalid_access; 404 not_found; 409 invalid_idempotent_request or concurrent_idempotent_requests; 422 validation_error (also: tenant_id conflicts with the domain’s tenant; deleting a tenant that still has domains); 429 quota errors.

application/json

object

statusCode

required

integer

name

required

Machine-readable error name.

missing_api_key (401): no bearer token.
invalid_api_key (403): unknown or malformed key.
restricted_api_key (401): the key is sending_access (or limited to another domain).
validation_error (422): invalid request. Also used with 403 for plan limits and test-domain restrictions.
not_found (404): the resource does not exist or belongs to another team.
method_not_allowed (405)
invalid_idempotency_key (400): key length outside 1 to 256.
concurrent_idempotent_requests (409): the original request is still running.
invalid_idempotent_request (409): the key was used with a different payload.
rate_limit_exceeded (429)
daily_quota_exceeded (429): the sandbox, daily limit or a tenant’s daily_limit was reached.
monthly_quota_exceeded (429): the plan’s monthly limit was reached (Free plan).
invalid_from_address (403): the sender domain is not verified.
invalid_access (422; 403 when a team that is not trusted tries to unpause a tenant paused for its bounce or complaint rate)
invalid_parameter (422)
sending_paused (403): sending is paused for the team, or for the tenant named by tenant_id, after a bounce or complaint spike or a manual pause.
security_error (451)
application_error (500)
internal_server_error (500)

string

Allowed values: missing_api_key invalid_api_key restricted_api_key validation_error not_found method_not_allowed invalid_idempotency_key concurrent_idempotent_requests invalid_idempotent_request rate_limit_exceeded daily_quota_exceeded monthly_quota_exceeded invalid_from_address invalid_access invalid_parameter sending_paused security_error application_error internal_server_error

message

required

string

Examples

{
  "statusCode": 422,
  "name": "validation_error",
  "message": "`subject`: Invalid input: expected string, received undefined"
}

{
  "statusCode": 404,
  "name": "not_found",
  "message": "Email not found"
}

{
  "statusCode": 401,
  "name": "missing_api_key",
  "message": "Missing API key in the authorization header. Include `Authorization: Bearer sp_live_...`."
}

409

An error. Common statuses: 400 invalid_idempotency_key; 401 missing_api_key or restricted_api_key; 403 invalid_api_key, invalid_from_address, sending_paused (team or tenant) or invalid_access; 404 not_found; 409 invalid_idempotent_request or concurrent_idempotent_requests; 422 validation_error (also: tenant_id conflicts with the domain’s tenant; deleting a tenant that still has domains); 429 quota errors.

application/json

object

statusCode

required

integer

name

required

Machine-readable error name.

missing_api_key (401): no bearer token.
invalid_api_key (403): unknown or malformed key.
restricted_api_key (401): the key is sending_access (or limited to another domain).
validation_error (422): invalid request. Also used with 403 for plan limits and test-domain restrictions.
not_found (404): the resource does not exist or belongs to another team.
method_not_allowed (405)
invalid_idempotency_key (400): key length outside 1 to 256.
concurrent_idempotent_requests (409): the original request is still running.
invalid_idempotent_request (409): the key was used with a different payload.
rate_limit_exceeded (429)
daily_quota_exceeded (429): the sandbox, daily limit or a tenant’s daily_limit was reached.
monthly_quota_exceeded (429): the plan’s monthly limit was reached (Free plan).
invalid_from_address (403): the sender domain is not verified.
invalid_access (422; 403 when a team that is not trusted tries to unpause a tenant paused for its bounce or complaint rate)
invalid_parameter (422)
sending_paused (403): sending is paused for the team, or for the tenant named by tenant_id, after a bounce or complaint spike or a manual pause.
security_error (451)
application_error (500)
internal_server_error (500)

string

Allowed values: missing_api_key invalid_api_key restricted_api_key validation_error not_found method_not_allowed invalid_idempotency_key concurrent_idempotent_requests invalid_idempotent_request rate_limit_exceeded daily_quota_exceeded monthly_quota_exceeded invalid_from_address invalid_access invalid_parameter sending_paused security_error application_error internal_server_error

message

required

string

Examples

{
  "statusCode": 422,
  "name": "validation_error",
  "message": "`subject`: Invalid input: expected string, received undefined"
}

{
  "statusCode": 404,
  "name": "not_found",
  "message": "Email not found"
}

{
  "statusCode": 401,
  "name": "missing_api_key",
  "message": "Missing API key in the authorization header. Include `Authorization: Bearer sp_live_...`."
}

422

An error. Common statuses: 400 invalid_idempotency_key; 401 missing_api_key or restricted_api_key; 403 invalid_api_key, invalid_from_address, sending_paused (team or tenant) or invalid_access; 404 not_found; 409 invalid_idempotent_request or concurrent_idempotent_requests; 422 validation_error (also: tenant_id conflicts with the domain’s tenant; deleting a tenant that still has domains); 429 quota errors.

application/json

object

statusCode

required

integer

name

required

Machine-readable error name.

missing_api_key (401): no bearer token.
invalid_api_key (403): unknown or malformed key.
restricted_api_key (401): the key is sending_access (or limited to another domain).
validation_error (422): invalid request. Also used with 403 for plan limits and test-domain restrictions.
not_found (404): the resource does not exist or belongs to another team.
method_not_allowed (405)
invalid_idempotency_key (400): key length outside 1 to 256.
concurrent_idempotent_requests (409): the original request is still running.
invalid_idempotent_request (409): the key was used with a different payload.
rate_limit_exceeded (429)
daily_quota_exceeded (429): the sandbox, daily limit or a tenant’s daily_limit was reached.
monthly_quota_exceeded (429): the plan’s monthly limit was reached (Free plan).
invalid_from_address (403): the sender domain is not verified.
invalid_access (422; 403 when a team that is not trusted tries to unpause a tenant paused for its bounce or complaint rate)
invalid_parameter (422)
sending_paused (403): sending is paused for the team, or for the tenant named by tenant_id, after a bounce or complaint spike or a manual pause.
security_error (451)
application_error (500)
internal_server_error (500)

string

Allowed values: missing_api_key invalid_api_key restricted_api_key validation_error not_found method_not_allowed invalid_idempotency_key concurrent_idempotent_requests invalid_idempotent_request rate_limit_exceeded daily_quota_exceeded monthly_quota_exceeded invalid_from_address invalid_access invalid_parameter sending_paused security_error application_error internal_server_error

message

required

string

Examples

{
  "statusCode": 422,
  "name": "validation_error",
  "message": "`subject`: Invalid input: expected string, received undefined"
}

{
  "statusCode": 404,
  "name": "not_found",
  "message": "Email not found"
}

{
  "statusCode": 401,
  "name": "missing_api_key",
  "message": "Missing API key in the authorization header. Include `Authorization: Bearer sp_live_...`."
}

429

Too many requests (rate_limit_exceeded), or a daily or monthly sending quota was reached (daily_quota_exceeded also means a tenant’s daily_limit).

application/json

object

statusCode

required

integer

name

required

Machine-readable error name.

missing_api_key (401): no bearer token.
invalid_api_key (403): unknown or malformed key.
restricted_api_key (401): the key is sending_access (or limited to another domain).
validation_error (422): invalid request. Also used with 403 for plan limits and test-domain restrictions.
not_found (404): the resource does not exist or belongs to another team.
method_not_allowed (405)
invalid_idempotency_key (400): key length outside 1 to 256.
concurrent_idempotent_requests (409): the original request is still running.
invalid_idempotent_request (409): the key was used with a different payload.
rate_limit_exceeded (429)
daily_quota_exceeded (429): the sandbox, daily limit or a tenant’s daily_limit was reached.
monthly_quota_exceeded (429): the plan’s monthly limit was reached (Free plan).
invalid_from_address (403): the sender domain is not verified.
invalid_access (422; 403 when a team that is not trusted tries to unpause a tenant paused for its bounce or complaint rate)
invalid_parameter (422)
sending_paused (403): sending is paused for the team, or for the tenant named by tenant_id, after a bounce or complaint spike or a manual pause.
security_error (451)
application_error (500)
internal_server_error (500)

string

Allowed values: missing_api_key invalid_api_key restricted_api_key validation_error not_found method_not_allowed invalid_idempotency_key concurrent_idempotent_requests invalid_idempotent_request rate_limit_exceeded daily_quota_exceeded monthly_quota_exceeded invalid_from_address invalid_access invalid_parameter sending_paused security_error application_error internal_server_error

message

required

string

Example

{
  "statusCode": 429,
  "name": "rate_limit_exceeded",
  "message": "Too many requests. You can only make 10 requests per second."
}

Headers

retry-after

integer

Seconds to wait before retrying.

ratelimit-limit

integer

Requests allowed per second for your team.

ratelimit-remaining

integer

Requests left in the current one-second window.

ratelimit-reset

integer

Seconds until the window resets.

Send an email

Authorizations

Parameters

Header Parameters

Example

Request Bodyrequired

Examples

Responses

200

Example

Headers

400

Examples

401

Examples

403

Examples

409

Examples

422

Examples

429

Example

Headers

Request Body^required