@evan I'm not counting disposable ones - hundreds of those. #Zimbra EMail supports an arbitrary number, a great feature for keeping all those shopping sites etc. separate and shutting down any that get leaked. (I keep my old myspace one as a #HoneyPot - still see occasional spam on it).
Unlike GMail's +tag feature, Zimbra disposable emails can't easily be tracked back to my real email.
help.ncf.ca/Disposable_email_a