Are there plans for providing an API for creating mailboxes/domains? We previously used Mailgun for mailboxes (back when they still provided them) and ever sin

Are there plans for providing an API for creating mailboxes/domains? We previously used Mailgun for mailboxes (back when they still provided them) and ever since they discontinued mailbox support we've been looking for a solid mailbox provider that can handle any number of domains, mailboxes and aliases.