It can be very useful to offer the ability for a user to leave their email when giving feedback on an FAQ or Workflows so you can follow up with them.
You can turn this feature on for FAQ's and/or Workflows via Settings --> FAQ --> General or Settings --> Workflow --> General respectively.
You can enable it for all feedback or just for negative feedback. The default wording shown to the user is "If you'd like a follow up to this comment please leave your email address" but you can change this wording via the language file - see here for more details.
If the user has left an email address, there will be a "click to email" icon displayed next to the feedback in MyMalcolm.
If you'd prefer a user to complete a Workflow when they rate content see this FAQ.