He is likely not behind a proxy. He has Telenet n.v, Belgium as his isp. He knows Dutch(Nederlands) language, and uses
www.google.be. 78.23.188.180 from Belgium as he passed through
http://www.google.be/url?sa=t_source=web_cd=8_ved on 29 jun, 15:24. Source from traceroot and ip history.
He is also one of the bitcoins nodes as listed in
https://smsz.net/btcStats/bitcoin.kml (a google maps location file showing bitcoin nodes hosted by mtgox). Hence that makes him using a proxy highly unlikely unless he is running some private permanent VPS.
I'll get to it later; now relaxing
PS: Could you give me a copy of his email to you with headers? I could try tracing stuff from there