Actually, it's entirely technically possible that your emails and PM's passing through ECCIE can be read, scanned for keywords, etc. An administrator (or any person given administrator privileges) of any board site had the ability to look into emails. And you also don't possess any legal right to privacy with them either from the owner.
Your employer has the legal right to monitor your keyboard strokes, record personal emails you send through Gmail, Yahoo or any other external mail site if you use their equipment. The courts have also upheld that if you use your personal email accounts, your employer can LOOK at your private email by using your own passwords, or Facebook, or whatever. Also, if you are using an IP phone, you have no legal right to privacy in your conversations. That, too, can be monitored by your employer for any reason they choose.
Now, if you have an 'old school' analog phone system, then that requires a court order to tap, even if it's an employer-owned device. Why? Because of the way the laws are written... voice communications are protected under the Federal Wiretapping statutes, data is not. And a VOIP phone converts voice to data and isn't covered.
So the security just comes down to a trust issue... do you trust the site you are on? Do you trust your employer? Neither have to TELL you that they are monitoring communications.
So keep that in mind next time you share something very personal or important.