SharePoint Online provider host Send Email - Access denied - email

Question

I'm developing a SharePoint Provider hosted Add-ins using CSOM and I'm having Access Denied when sending a email using:
EmailProperties emailProperties = new EmailProperties();
emailProperties.To = emailAddresses;
emailProperties.From = "no-reply#sharepointonline.com";
emailProperties.Body = #"XXXXX";
emailProperties.Subject = viagem.Title;
Utility.SendEmail(context, emailProperties);
context.ExecuteQuery();
[ServerUnauthorizedAccessException: Access denied. You do not have
permission to perform this action or access this resource.]
Microsoft.SharePoint.Client.ClientRequest.ProcessResponseStream(Stream
responseStream) +2911
Microsoft.SharePoint.Client.ClientRequest.ProcessResponse() +1564
The App already has some permissions:
<AppPermissionRequest Scope="http://sharepoint/content/sitecollection/web" Right="FullControl" />
<AppPermissionRequest Scope="http://sharepoint/social/tenant" Right="Read" />
<AppPermissionRequest Scope="http://sharepoint/bcs/connection" Right="Read" />
I have two questions:
1- What permissions do I need to add?
2- I'm trying to use "no-reply#sharepointonline.com" as the sender because that's the address used in workflows as sender.
Anyone knows what is the default email for email messages in SharePoint Online?
Thanks

Answer 1

Solve it.
1 - Site collection permissions.
2 - I can use the "no-reply#sharepointonline.com"