I would like to be able to modify the Ideas Portal's initial "You've been invited..." email in the same way that I can modify all other emails that the Ideas Portal sends to my users. I would also like the ability to modify the "from" address to reflect my company's domain.
Good news! You can now customize the content in the invitation emails that are sent to ideas portal users. Use the new invitation template that is available in your portal settings on the 'Email branding' tab.