When you search for a job you are managing leads and contacts. It's like your own little congregation, or network, and part of the search process is keeping a good contact list. Filing emails away is good, but it isn't a complete picture. Some people are excellent with Calendar reminders and notes, but honestly most people miss items or they receive a reminder when they can't stop and take action.
I recommend opening a Google doc that you can access from your phone. Your list will begin small, but I promise you it will become robust in time as you search for opportunities. Career searchers who keep their lists updated and take actions, land jobs.