If your Smarthost is using Port 25, you'll need to change that. Verizon blocked that a while back. Otherwise, as mentioned above be careful with servers when it comes down to the TOS. Servers are cool to have in-house, but you shouldn't be hosting public services (E-mail, Web, and FTP are notable if they're public). Stuff local to your network or for private, password-protected use, Verizon could honestly care less as long as it's not malicious.
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