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A Clever Spam Delivery Mechanism

This week a client forwarded me a spam email he received that I thought was interesting. It is reproduced below, with sensitive information and spam links redacted out:

The spammers were seemingly spoofing the email address of my client while making a malformed shipping request against a web service on the www.jal.co.jp domain. When the web service received the malformed request, it sent an error message back to my client's email address, the content of which contained links to a pharma site.

I think this is a really clever tactic, because the spam messages benefit from the strength of the legitimate www.jal.co.jp domain, and are thus less likely to be blocked by spam filters.

Well-played, spammers.