I can see how this would be useful for someone who works away a lot, especially doing work with long trips. However, it does strike me as a significant risk of identify fraud, so I wouldn't use such a service unless I really was going to be away for long periods of time.
Mail is still considered the most legally robust way of handling communications, and is still the ONLY method of communication used by certain businesses.
For example, a number of years ago, I renewed my car insurance, and paid by CC, shortly before going off on a long business trip. For some reason, the CC payment failed, so the insurance company wrote by mail telling me that the payment failed and to contact them urgently, otherwise they will cancel the policy. I was out of the country for a couple of weeks, so didn't pick up the letter until I got back.
By the time I'd opened the letter and called the insurance company, it was too late. The policy was terminated for breach of contract. My protests that they could have e-mailed me (seeing as they were an "online" compay), or phoned me or SMSed me came to nothing; they just said, mail is the only legally proven way to communicate for important matters. Now, I'm pretty much blacklisted from ever getting insurance again, except via "specialist" insurers that offer super-expensive policies for people with DUIs, previous fraudulent claims, etc.
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