Emails API

All endpoints require a bearer token (a login JWT or an API key) and a permission, listed with each endpoint.

INFO

Email hosting is offered on request - contact us before using these endpoints.

Mailboxes live on a domain you have already verified. If the domain's ownership is not verified yet, creating a mailbox returns 400 "Domain ownership is not verified. Publish the domain ownership TXT record (microapps-verify) and verify the domain before creating emails." See the Domains API.

Mailboxes are addressed by their id - a 24-character hex string - in every path: /api/emails/:domainName/:id.

The email object

json

{
  "id": "6a4d5b83b7006ccae6391b22",
  "email": "[email protected]",
  "domainName": "example.com",
  "storageSize": 5,
  "status": "ACTIVE",
  "alias": "",
  "catchAll": 0,
  "diskUsage": 20971520,
  "serverId": "6a4d5b83b7006ccae6391f88",
  "createdAt": "2026-09-01T12:00:00Z",
  "updatedAt": null
}

Field	Meaning
`id`	The mailbox id. Use it in every `/api/emails/:domainName/:id` path.
`email`	The full address.
`storageSize`	Mailbox quota in GB (1 to 50).
`status`	`ACTIVE` or `DISABLED` (you set these). `SUSPENDED` is set by us and locks the mailbox.
`alias`	Forwarding target. Empty string means no forwarding.
`catchAll`	`1` if this mailbox receives all mail sent to unknown addresses on the domain, else `0`. A number, not a boolean, on the way out; a boolean on the way in.
`diskUsage`	Current usage in bytes.
`serverId`	The mail server the domain's mailboxes live on.
`updatedAt`	`null` until the mailbox is first changed.

List mailboxes

http

GET /api/emails?domain=example.com&page=1&limit=20&search=hello

Needs email:read. Paginated, newest first. The domain filter is optional; without it you get mailboxes across all your domains. search matches email, domainName, alias, and status.

bash

curl "https://cloud-api.microapps.io/api/emails?domain=example.com" \
  -H "Authorization: Bearer $MICROAPPS_API_KEY"

json

{
  "data": [
    {
      "id": "6a4d5b83b7006ccae6391b22",
      "email": "[email protected]",
      "domainName": "example.com",
      "storageSize": 5,
      "status": "ACTIVE",
      "alias": "",
      "catchAll": 0,
      "diskUsage": 20971520,
      "serverId": "6a4d5b83b7006ccae6391f88",
      "createdAt": "2026-09-01T12:00:00Z",
      "updatedAt": null
    }
  ],
  "total": 1,
  "page": 1,
  "limit": 20,
  "totalPages": 1
}

Mailbox counts per domain

http

GET /api/emails/domains

Needs email:read. One entry per domain that has at least one mailbox, sorted by name:

json

[
  { "domainName": "example.com", "count": 3 }
]

Create a mailbox

http

POST /api/emails/:domainName

Needs email:create, $3 of credit, and a free slot under your mailbox limit.

bash

curl -X POST https://cloud-api.microapps.io/api/emails/example.com \
  -H "Authorization: Bearer $MICROAPPS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "email": "[email protected]",
    "password": "Sup3rSecret",
    "storageSize": 5,
    "serverId": "6a4d5b83b7006ccae6391f88"
  }'

Field	Type	Notes
`email`	string	The full address. Its domain part must equal `:domainName`, or you get `400 "Email domain does not match the domain name: ... vs ..."`. The part before the `@` must be 1 to 64 characters of lowercase letters, digits, `.`, `_` and `-`, none of them at the start or end.
`password`	string	8+ characters with an uppercase letter, a lowercase letter, and a digit.
`storageSize`	number	Quota in GB, 1 to 50. Required.
`serverId`	string	Only required the first time you create a mailbox on the domain (it picks the mail server, and must be one that offers email hosting). Omit it afterwards; the domain's existing server is reused.

Response 201 with the email object, status already ACTIVE. Email addresses are globally unique, so a duplicate returns 400 "Email is already taken.".

New mailboxes go live within a few seconds rather than instantly.

Describe a mailbox

http

GET /api/emails/:domainName/:id

Needs email:read.

bash

curl https://cloud-api.microapps.io/api/emails/example.com/6a4d5b83b7006ccae6391b22 \
  -H "Authorization: Bearer $MICROAPPS_API_KEY"

Update a mailbox

http

PUT /api/emails/:domainName/:id

Needs email:update. Every field is optional - send only what you want to change:

bash

curl -X PUT https://cloud-api.microapps.io/api/emails/example.com/6a4d5b83b7006ccae6391b22 \
  -H "Authorization: Bearer $MICROAPPS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "alias": "[email protected]", "storageSize": 10 }'

Field	Type	Notes
`password`	string	New password (same rules as create).
`alias`	string	Forward a copy of incoming mail here. Send `""` to clear it. Cannot equal the mailbox's own address (`400 "Alias cannot be the same as the email"`).
`catchAll`	boolean	Make this the catch-all for the domain. Sent as `true`/`false`; read back as `1`/`0`. Only one mailbox per domain can hold it: enabling it while another already does returns `400` naming that mailbox.
`status`	string	`ACTIVE` or `DISABLED` only, otherwise `400 "Status can either be ACTIVE or DISABLED"`.
`storageSize`	number	New quota in GB, 1 to 50.

Response 200 with the updated mailbox. Sending nothing that differs from the current values is a no-op that still returns 200.

Suspended mailboxes

A SUSPENDED mailbox rejects all edits (400 "Cannot update a suspended email"), and you cannot set SUSPENDED yourself - it is an account-level state we manage.

Delete a mailbox

http

DELETE /api/emails/:domainName/:id

Needs email:delete. Returns 204. The mailbox and its mail are gone; this is irreversible.

Mailbox stats

http

GET /api/emails/:domainName/:id/mailbox-stats

Needs email:read. A live count plus the last activity timestamps:

json

{
  "messageCount": 214,
  "lastSent": "2026-09-15T09:12:00Z",
  "lastReceived": "2026-09-16T06:44:00Z"
}

lastSent and lastReceived are null until the mailbox has sent or received something. messageCount is best effort: if the count cannot be taken, it comes back 0 rather than failing the call.

Set up email on a domain

http

POST /api/emails/:domainName/email-setup

Needs email:update and $3 of credit.

bash

curl -X POST https://cloud-api.microapps.io/api/emails/example.com/email-setup \
  -H "Authorization: Bearer $MICROAPPS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{ "emailServerId": "6a4d5b83b7006ccae6391f88" }'

Response 201 with no body. Turns on email for the domain and adds the records you need to publish to the domain's dnsRecords (all with TTL 300):

Record	`recordType`	Name	Purpose	Required
MX	MX	`@`	Where mail is delivered	Yes
SPF	TXT	`@`	Authorises our servers to send for you	Yes
DKIM	TXT	`<domain-id>._domainkey`	Signs your outbound mail	Yes
DMARC	TXT	`_dmarc`	Reporting and policy	Optional
SRV	SRV	`_imaps._tcp`	IMAP autodiscovery (993)	Optional
SRV	SRV	`_submission._tcp`	SMTP submission autodiscovery (587)	Optional

Read the exact values back from GET /api/domains/:id. A domain that already has email returns 400 "Domain already has an email server assigned" - use regenerate instead.

Revalidate DNS

http

POST /api/emails/:domainName/revalidate-dns

Needs email:update. Re-checks every published record on the domain right now - ownership, pointing and SSL records included, not just the email ones - and updates each record's status and the domain's dnsStatus. Response 200 with no body; read the results back from GET /api/domains/:id. This is what the console's Recheck DNS button calls.

Regenerate DNS

http

POST /api/emails/:domainName/regenerate-dns

Needs email:update. Wipes the domain's record list and rebuilds it from a fresh identity. Response 200 with no body. This is what the console's Regenerate Records button calls.

Regenerating invalidates three records you have already published

It rotates all of these at once, and every record starts unverified again:

the ownership TXT gets a new verification token,
the DKIM key rotates, so the _domainkey TXT value changes,
the SSL delegation label rotates, so the _acme-challenge CNAME target changes.

Update all three at your DNS provider afterwards. Certificates already issued keep serving until they expire, but the next renewal fails if the _acme-challenge CNAME is stale.

Remove email setup

http

DELETE /api/emails/:domainName/email-setup

Needs email:update. Strips the email records and unassigns the mail server. Ownership, pointing and SSL records are left alone. Returns 204.

Delete the domain's mailboxes first: while any remain, this returns 400 "Cannot delete domain with active emails".

Metrics

Sent / received / bounced counts at three scopes, all needing email:read. Add ?from= and ?to= (RFC3339 or YYYY-MM-DD, where to counts to end of day) to pick a window - the default is the last 7 days and the range is capped at 90 days.

Endpoint	Scope
`GET /api/emails/:domainName/:id/metrics`	Mailbox total
`GET /api/emails/:domainName/:id/metrics/daily`	Mailbox, daily
`GET /api/emails/:domainName/metrics`	Domain total
`GET /api/emails/:domainName/metrics/daily`	Domain, daily
`GET /api/emails/metrics/account`	Account total
`GET /api/emails/metrics/account/daily`	Account, daily

Totals:

bash

curl "https://cloud-api.microapps.io/api/emails/example.com/metrics?from=2026-09-09&to=2026-09-16" \
  -H "Authorization: Bearer $MICROAPPS_API_KEY"

json

{ "sent": 1842, "received": 5310, "bounced": 7 }

Daily variants return an array, one row per day that had activity:

json

[
  { "date": "2026-09-15", "sent": 264, "received": 771, "bounced": 1 },
  { "date": "2026-09-16", "sent": 301, "received": 688, "bounced": 0 }
]

The two account-level endpoints are the only ones that take no domain in the path.

Unsubscribes

Every message you send carries a one-click unsubscribe link. When a recipient uses it, their address is added to your domain's suppression list and you stop sending to it.

http

GET /api/unsubscribes/:domainId?page=1&limit=20

Needs email:read. Note this one takes the domain's id, not its name. Paginated list of unsubscribed addresses:

bash

curl https://cloud-api.microapps.io/api/unsubscribes/6a4d5b83b7006ccae6391c41 \
  -H "Authorization: Bearer $MICROAPPS_API_KEY"

json

{
  "data": [
    {
      "id": "6a4d5b83b7006ccae6392055",
      "email": "[email protected]",
      "domain": "example.com",
      "accountId": "6a4d5b83b7006ccae639100a",
      "domainId": "6a4d5b83b7006ccae6391c41",
      "createdAt": "2026-09-14T18:22:41Z"
    }
  ],
  "total": 1,
  "page": 1,
  "limit": 20,
  "totalPages": 1
}

http

DELETE /api/unsubscribes/:domainId/:email

Needs email:update. Removes an address from the list, which re-enables sending to it. Returns 204. A malformed domain id returns 400 "Invalid domain ID".

bash

curl -X DELETE https://cloud-api.microapps.io/api/unsubscribes/6a4d5b83b7006ccae6391c41/[email protected] \
  -H "Authorization: Bearer $MICROAPPS_API_KEY"

Emails API ​

The email object ​

List mailboxes ​

Mailbox counts per domain ​

Create a mailbox ​

Describe a mailbox ​

Update a mailbox ​

Delete a mailbox ​

Mailbox stats ​

Set up email on a domain ​

Revalidate DNS ​

Regenerate DNS ​

Remove email setup ​

Metrics ​

Unsubscribes ​

Emails API

The email object

List mailboxes

Mailbox counts per domain

Create a mailbox

Describe a mailbox

Update a mailbox

Delete a mailbox

Mailbox stats

Set up email on a domain

Revalidate DNS

Regenerate DNS

Remove email setup

Metrics

Unsubscribes