Definitely something a lot of customers would benefit from.

Only having the smtp option is very limited, and customers usually don't allow smtp to be used directly. So they are not able to use the built-in email sending, nor the OutSystems way to create emails. Usually they have to revert to manually appending html code to get what they need.

We could really use a system similar to how authentication plugins or database connector plugins are used. This way we can easily integrate an external system, while still benefiting from the email features of the platform. 

(I've been thinking about creating something myself by disabling the scheduler service from picking up emails)

I just came across this on a client, do not use direct SMTP sending :(

It would be very interesting, especially in times of cloud services.

You can still integrate with Sendgrid by using smtp.sendgrid.net as the smtp server in outsystems