Mailboxes
List mailboxes
GET
cURL
Lists the mailboxes your API key can reach. A key restricted to one domain only sees that domain’s mailboxes.
Each mailbox says how many seconds its owner gave Undo after Send in webmail (
undo_send_seconds, 0 when off) and whether a signature is added to what it sends (has_signature). The signature itself is never returned: the server adds it when the message is sent.
The mailbox endpoints need an API key with full access. A sending-only key gets
403 FORBIDDEN. See the Mailbox API guide.