It is indeed of great social importance that child porn be eradicated. However, I take great exception to Liao Kui-fu's (
This is very irresponsible advice. A more reasonable approach would be to have the e-mail forwarded to appropriate law enforcement authorities prior to being deleted. If you just ignore the problem, will it go away? Liao's advice pretty much follows this kind of thinking. If you allow authorities to try and track the origins of these e-mails, it would much better serve the cause of putting an end to child pornography and child pornographers.
I think it would be of interest to you and your readers to consider this point, and amend Liao's advice accordingly.