Api for querying the status of an email

[knurzl]

It would be nice to have an api endpoint to query the status of an email with the id from the send response.

[liltechnomancer]

Will try to get this out soon. The API has a lot of improvements needed.

[liltechnomancer]

Update: this is in pro now, and will come to the OS version when I merge the features that will be in both.