I've read it posited that it's a bot intended for 外資系企業の転職・求人エージェント|エンワールド・ジャパン - よくあるご質問 (enworld.com), a Japanese jobs site, probably just one on a long list of sites on its itinerary of spamming. Perhaps they didn't even put in the wrong address, and it just spams every major top-level domain...