If a subscriber is availing your email service, you can check the email that you are hosting for him/ her. This way, you can help your subscribers figure out solutions when they have problems regarding their emails.
Three ways to check a subscriber's email:
c) Click on the subscriber, then go to the Subscriber on the menu bar, then to Subscriber Tools, then Check Email.
Any one of these ways will display a list of usernames that the subscriber uses for the email. Clicking on one username will lead you to the email login page for the selected subscriber. The username and password are already filled out for you (but you can always change these if you want to). You only have to click Login to gain access to the email.