Hi, to just send with that service, you can install the SMTP addon (o generally an SMTP plugin). They provide API as well, but there is no much benefit to implement the integration since an SMTP plugin will do as well as a direct integration.
They do not provide a webhook to be notified on bounced addresses, which is now of the key feature of a delivery service. Maybe in the future they’ll be able to add that feature and then it’s worth to code a whole integration.
Thanks!