curl --request POST \
--url https://console.mermail.app/api/v1/mailboxes/{mailboxId}/drafts \
--header 'Content-Type: application/json' \
--header 'x-api-key: <api-key>' \
--data '
{
"body": "<p>Working…</p>"
}
'import requests
url = "https://console.mermail.app/api/v1/mailboxes/{mailboxId}/drafts"
payload = { "body": "<p>Working…</p>" }
headers = {
"x-api-key": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
body: JSON.stringify({body: JSON.stringify('<p>Working…</p>')})
};
fetch('https://console.mermail.app/api/v1/mailboxes/{mailboxId}/drafts', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://console.mermail.app/api/v1/mailboxes/{mailboxId}/drafts",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'body' => '<p>Working…</p>'
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json",
"x-api-key: <api-key>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://console.mermail.app/api/v1/mailboxes/{mailboxId}/drafts"
payload := strings.NewReader("{\n \"body\": \"<p>Working…</p>\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("x-api-key", "<api-key>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://console.mermail.app/api/v1/mailboxes/{mailboxId}/drafts")
.header("x-api-key", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"body\": \"<p>Working…</p>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://console.mermail.app/api/v1/mailboxes/{mailboxId}/drafts")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["x-api-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"body\": \"<p>Working…</p>\"\n}"
response = http.request(request)
puts response.read_body{
"id": "dft_01",
"draft_id": "dft_01",
"status": "draft",
"subject": "Draft",
"recipient": "[email protected]",
"date": "2026-07-16T10:00:00.000Z"
}{
"error": "Unauthorized"
}{
"error": "Invalid request"
}{
"error": "Forbidden"
}{
"error": "Too many requests"
}Save draft
Plans: Free · Developer · Enterprise
Creates a draft (or replaces an existing draft when draft_id is set). Body is HTML/text in the body field — not html/text. Do not send scheduled_send_at here; use POST /scheduled-sends. Returns 201.
API credits: 2 (write).
curl --request POST \
--url https://console.mermail.app/api/v1/mailboxes/{mailboxId}/drafts \
--header 'Content-Type: application/json' \
--header 'x-api-key: <api-key>' \
--data '
{
"body": "<p>Working…</p>"
}
'import requests
url = "https://console.mermail.app/api/v1/mailboxes/{mailboxId}/drafts"
payload = { "body": "<p>Working…</p>" }
headers = {
"x-api-key": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
body: JSON.stringify({body: JSON.stringify('<p>Working…</p>')})
};
fetch('https://console.mermail.app/api/v1/mailboxes/{mailboxId}/drafts', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));<?php
$curl = curl_init();
curl_setopt_array($curl, [
CURLOPT_URL => "https://console.mermail.app/api/v1/mailboxes/{mailboxId}/drafts",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "POST",
CURLOPT_POSTFIELDS => json_encode([
'body' => '<p>Working…</p>'
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json",
"x-api-key: <api-key>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://console.mermail.app/api/v1/mailboxes/{mailboxId}/drafts"
payload := strings.NewReader("{\n \"body\": \"<p>Working…</p>\"\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("x-api-key", "<api-key>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.post("https://console.mermail.app/api/v1/mailboxes/{mailboxId}/drafts")
.header("x-api-key", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"body\": \"<p>Working…</p>\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://console.mermail.app/api/v1/mailboxes/{mailboxId}/drafts")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["x-api-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"body\": \"<p>Working…</p>\"\n}"
response = http.request(request)
puts response.read_body{
"id": "dft_01",
"draft_id": "dft_01",
"status": "draft",
"subject": "Draft",
"recipient": "[email protected]",
"date": "2026-07-16T10:00:00.000Z"
}{
"error": "Unauthorized"
}{
"error": "Invalid request"
}{
"error": "Forbidden"
}{
"error": "Too many requests"
}Authorizations
API key (sk-proj-…) from Settings → API Keys. Required for sold API calls outside the Mermail console.
Path Parameters
Mailbox public_id (UUID), hosted alias id, or current email
Body
Draft body (HTML or plain text)
"<p>Working…</p>"
"Draft"
Existing draft id to replace
Base64 file bytes or an existing attachment_id from the same authorized mailbox. Omit to preserve attachments from source_draft_id (send) or draft_id (save/schedule); [] clears; an array replaces the complete set. Storage limits: 20 files, 10 MiB each, 25 MiB decoded total. Encoded message limits include overhead: about 5 MiB for hosted addresses and about 40 MB for custom-domain addresses. Local paths and URLs are not accepted.
20- Option 1
- Option 2
Hide child attributes
Hide child attributes
Base64 encoded file bytes, without a data URL prefix.
1 - 255MIME type, e.g. application/pdf.
attachment, inline Unique bare Content-ID required for inline PNG/JPEG/GIF/WebP; use matching HTML src=cid:contentId.
worker-aes-v1 Response
Success
The response is of type object.
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