For an instructor, this adds an unnecessary layer of complexity to what should be a simple activity. If a student emails me a question via Canvas Inbox and it is forwarded to my standard school email account (we use Outlook Mail) then I should be able to answer that student from my regular school account and attach a file and have the student receive it where ever they are reading their email. Canvas Inbox or their school email account.
Add functionality that allows attachments to come through with an email reply from designated external email accounts or forwarded to their accounts fully intact!