I use Earth Class Mail to handle my postal mail. I signed a form and the post office redirects all my personal and business mail to them. I get an email every time I receive a letter and I can control what happens with my mail - open, scan, shred, recycle, forward or store. They can even deposit checks. It is not the cheapest such service however I have found it to be efficient and reliable. It works better for me than having a friend deal with mail because it is available 24/7 and doesn't make mistakes.
I save all the scanned PDFs of mail in a folder in Evernote so that I can easily search for mail on my laptop, web or smart phone plus it provide a second backup of the scans (they are stored by ECM too).