Integration of cloud services when sending e-mails

When sending emails/notifications from Moodle, it becomes increasingly important that they actually arrive. Cloud services such as Sendgrid, Mailgun, etc. are applications that specialise in this. 

My request is for (more) integrations into Moodle. Now these services also support SMTP, but sending mail via an API is much more secure.

I am thinking of structure with plugins where other parties can write the integration (Moodle plugin) themselves, similar to payment gateway