My number one trick to keep myself organized is what I call the one-touch rule. Procrastinating is not something that I do. There is no point in pushing back the completion of something that you will have to do anyway. Dealing with emails or regular mail is one of those things.
I know people that have thousands of emails on their accounts. Most of them are spam or promotions. The problem is that they either ignore or go over them many times. I use the one-touch to manage my emails.
Get used to open each email only once. You read it and decide what to do, archive it or delete it. Sometimes you need to take action with the information delivered. If that is the case, you can set that email as a task or appointment. Do not forget to include a due day for all your tasks.
With the regular mail is the same concept. Every day or whenever you go to the post office, you sort your letters. You categorize the mail into pay, archive, read, or trash. Prepare an area with a couple of bins as needed. I have the shredding machine in the same area, so promotions or any document with personal information goes immediately into it. Create the habit to take at least 30 minutes every week to go over those things in the pay and read category. Unless it is a magazine, you should be able to read or pay and either archive or trash within that time.
Think about it, this is common-sense. It is just a simple way to keep yourself organized.