REP, your best bet is to continue to rely on email, not SOL's messaging system. You can set up SOL so it forwards all your messages to email, and if you've ever communicated with a reader before, you can reply via email and it'll reach them (don't ask me how it does it, though).
Also, I encourage readers to contact me via email, since I still don't fully trust the messaging system (the messages all get deleted eventually, while I keep all of my reader and editor comments).
You'll also notice that SOL still provides readers with author's private email accounts, though most have probably forgotten it's available.