Hi Ozmike,
I create a connection from PowerApps to Outlook.com. Then create an App to send email using this connection. My steps for a reference:
1. Add three Text Box controls, name them as To Email Address, Subject, Body.
2. Add three Text Input controls, put them under three Text Box controls.
3. Add a button, and configure the Onselect property as 'Outlook.com'.SendEmail(TextInput1.Text,TextInput2.Text,TextInput3.Text)

In Preview mode run the App, fill an email address and subject and body in each box, click the Send Email button, an email would be sent.
The steps are the same with the connection to Office 365 outlook. You could also try with other actions.
If you need more information, please feel free reply.
Best regards,
Mabel Mao