I love these hacker-style games, and this one absolutely nails it. The combination of the pressing time limit (which the music really adds to) and the content of just about every email makes for a game that's hilarious and tense at the same instant. It's a pity that the three endings are - spoiler warning - just had by selecting one of three options.
I wonder if there's anything to find on any of those other IP addresses? I only ended up logging in as three people on one machine besides my own.