Base URL: https://app.dmu.email/api/v1
Authentication: Bearer dmk_… API key
Rate limit: 120 requests a minute per key

List scheduled messages

GET/scheduled

Lists every message waiting to go at a set time, soonest first.

Needs the permissionscheduled:list

It covers every mailbox the key’s owner can see, not only what this key scheduled. Move one with Reschedule a message, or cancel it with Delete a draft.

Returns

A list of messages, each with:

messageIdstring: The message.
threadIdstring: The conversation it’s in.
subjectstring: Its subject.
tolist of strings: Its recipients.
scheduledAtstring: When it will go.

Errors

401invalid_key: The key is wrong, expired or revoked. With no Authorization header at all, the code is missing_credentials.
403missing_scope: The key doesn’t have scheduled:list. The X-Required-Scope header names what’s missing.
429rate_limited: More than 120 requests a minute from this key. Wait for Retry-After seconds.

curl https://app.dmu.email/api/v1/scheduled \
  -H "Authorization: Bearer dmk_7f3a9c2e1b4d_Xq8v…"

Response

200 OK

{
  "data": [
    {
      "messageId": "8c1e2f4a",
      "threadId": "f3d86b25",
      "subject": "Your September statement",
      "to": ["maria@example.com"],
      "scheduledAt": "2026-09-28T06:00:00.000Z"
    }
  ]
}

Every response wraps its result in data. A page of threads adds nextCursor, which is null on the last page.