Staying on top of your mail with a sensible filing system is the best way to organize bills and letters and ensure you respond to them in a timely fashion. To do this effectively, you’ll need to sort mail as soon as it comes in – don’t put it off. By sort, we don’t necessarily mean ‘action’, rather categorize it so you know what you’re dealing with.
You can get rid of junk there and then, but set aside some time once a day, or once a week, to deal with anything outstanding; unpaid bills, return slips, RSVPs, and so on. Opt for digital correspondence where you can going forwards to keep mail to a minimum; you’re much more likely to stay on top of it that way.