Send a message as the connected Microsoft account
Send a message as the connected Microsoft account
Request
- x-api-key: <your-api-key>
- Content-Type: application/json
Response
{
"accepted": true,
"message": "Hello from castomAPI.",
"status": "success",
"tokensDeducted": 2
}What it does
Send a message as the connected Microsoft account
Request
Parameters
| Field | In | Type | Required | Description |
|---|---|---|---|---|
accountId | query | string | no | Which connected Microsoft account to use, when more than one is connected |
Body
| Field | Type | Required | Description |
|---|---|---|---|
bcc | array<string> | no | |
body | string | yes | |
cc | array<string> | no | |
contentType | enum | no | One of: Text, HTML. |
saveToSentItems | boolean | no | |
subject | string | yes | |
to | array<string> | yes |
Example request
{
"bcc": [],
"body": "Hello from castomAPI.",
"cc": [],
"contentType": "Text",
"saveToSentItems": true,
"subject": "Your September invoice",
"to": [
"ada@example.com"
]
}Response
| Field | Type | Description |
|---|---|---|
accepted | boolean | |
message | string | |
status | string | |
tokensDeducted | integer |
Example response
{
"accepted": true,
"message": "Hello from castomAPI.",
"status": "success",
"tokensDeducted": 2
}Errors
Every error answers with the same envelope: an HTTP status, a machine code and a sentence.
400 | The body or a parameter failed validation. The details array names the field. |
401 | No key, a revoked key or a wrong header. Send x-api-key. |
402 | The wallet cannot cover this call. Top up or wait for the monthly grant. |
404 | The resource does not exist, or it is not yours. Both answer identically and cost nothing. |
429 | Over the per-minute quota of your tier. Back off and retry. |
5xx | Upstream refused or timed out. The call is not billed. |
Code
curl -X POST 'https://app.castomapi.com/v1/microsoft/mail/send' \
-H 'x-api-key: <your-api-key>' \
-H 'Content-Type: application/json' \
-d '{"bcc": [], "body": "Hello from castomAPI.", "cc": [], "contentType": "Text", "saveToSentItems": true, "subject": "Your September invoice", "to": ["ada@example.com"]}'const res = await fetch('https://app.castomapi.com/v1/microsoft/mail/send', {
method: 'POST',
headers: { 'x-api-key': '<your-api-key>', 'Content-Type': 'application/json' },
body: JSON.stringify({"bcc": [], "body": "Hello from castomAPI.", "cc": [], "contentType": "Text", "saveToSentItems": true, "subject": "Your September invoice", "to": ["ada@example.com"]})
});
const data = await res.json();
console.log(data);import { request } from 'node:https';
// Node 18+ has fetch built in
const res = await fetch('https://app.castomapi.com/v1/microsoft/mail/send', {
method: 'POST',
headers: { 'x-api-key': '<your-api-key>', 'Content-Type': 'application/json' },
body: JSON.stringify({"bcc": [], "body": "Hello from castomAPI.", "cc": [], "contentType": "Text", "saveToSentItems": true, "subject": "Your September invoice", "to": ["ada@example.com"]})
});
const data = await res.json();
console.log(data);import requests
res = requests.post(
'https://app.castomapi.com/v1/microsoft/mail/send',
headers={'x-api-key': '<your-api-key>'},
json={"bcc": [], "body": "Hello from castomAPI.", "cc": [], "contentType": "Text", "saveToSentItems": True, "subject": "Your September invoice", "to": ["ada@example.com"]},
timeout=30,
)
print(res.json())<?php
$ch = curl_init('https://app.castomapi.com/v1/microsoft/mail/send');
curl_setopt_array($ch, [
CURLOPT_CUSTOMREQUEST => 'POST',
CURLOPT_RETURNTRANSFER => true,
CURLOPT_HTTPHEADER => ['x-api-key: <your-api-key>', 'Content-Type: application/json'],
CURLOPT_POSTFIELDS => json_encode(['bcc' => [], 'body' => 'Hello from castomAPI.', 'cc' => [], 'contentType' => 'Text', 'saveToSentItems' => true, 'subject' => 'Your September invoice', 'to' => ['ada@example.com']]),
]);
$data = json_decode(curl_exec($ch), true);
print_r($data);Cost and limits
This operation costs 2 tokens. A call that fails is never billed. Every account gets 1000 free tokens a month; paid balances never expire.
Rate limits per minute
| No key | 10 |
| Free | 60 |
| Pro | 300 |
| Enterprise | 1200 |
Questions
What does Send a message as the connected Microsoft account cost?
2 tokens per successful call, debited from your wallet after the response. Failed calls are free. Every account receives 1000 free tokens a month.
How do I authenticate?
Send your key in the x-api-key header. One key covers every metered endpoint; there is nothing to enable per endpoint.
Can I send an Authorization: Bearer token instead?
Not for a metered endpoint — those take the x-api-key header and nothing else. Bearer tokens belong to the account side: the dashboard and account APIs accept a JWT session, and castomapi-auth issues those through a standard OAuth2 handshake, with authorization code, client credentials and refresh grants. The auth service page covers it.
What are the limits?
10 requests a minute per IP with no key at all, 60 a minute on the free tier, 300 on Pro, 1200 on Enterprise. Above the no-key tier the quota is per account, across every endpoint.
OpenAPI: https://app.castomapi.com/docs/json