Hi @Anonymous ,
Do you want to send/reply email in powerapps?
If so, I'm afraid you need office365 outlook connector.
Or else, it is not possible to send email in powerapps.
Firstly, let me talk about license.
Could you tell me what is your license?
Actually, office365 outlook is a standard connector, which does not need a premium license.
So I believe almost all the people could use this connector.
You only need a basic license, like office365 license including powerapps or dynamic 365 license including powerapps.
Here's a doc about license for your reference:
https://docs.microsoft.com/en-us/power-platform/admin/pricing-billing-skus
Secondly, could you describe more clearly about the feather that you want?
If you want to gat the Message Id, you could use GetEmailsV3 function.
Then you could reply to this email by using ReplyToV3 function.
I've made a similar test for your reference:
1)insert a gallery to display all the emails that you receive
set the gallery's Items:
Office365Outlook.GetEmailsV3().value
2)send reply to the mail that you select in the gallery:
Office365Outlook.ReplyToV3(Gallery6.Selected.id,{...})
Enter other information of the email in the {...} part.
Here's a doc about this connector for your reference:
https://docs.microsoft.com/en-us/connectors/office365/#get-emails-(v3)
Best regards,