I’m not aware of a way to natively have SF send an email directly from a row action in skuid, but here are two workarounds:
1) Open a new window directing the user to the SF email page: This post covers this pretty well. The user still has to go to the new page and click send.
Or
2) Add a boolean field on your object and pull it in your model but not your table. Have a row action that updates that hidden field to be true/false. You would then create a SF trigger, workflow, or process builder rule to send an email template when that hidden field value is changed.
Those are the options that I know of, but someone else may have a much better way of doing it.
