I use a catch all email address on my domain, and would like to be able to figure out what address is being sent spam email. Unfortunately, I can't find a way to see what address an email in my inbox was sent to. Is there a way to determine the addressee of an email in iOS 8?
You would likely have to have an email app capable of displaying the raw headers of the email to trace this information. I do not believe the iOS 8 Mail app has this capability; it simply displays the most user-friendly information (your catch-all To: address). However, if you can access the same account through the Mac OS X Mail application (or Outlook, etc.), you can view the raw headers there.