この直前にspam対策のチュートリアルがあって、その流れかと思ったのだが、実際にはISPの担当者っぽいターゲットだった模様？
企業のメイルサーバとしては受信拒否はほとんどありえないわけで、送信側でspamをうまくブロックして数そのものを減らしてくれるのを願うばかり。もっとも、日本国内で対策されればよそに移動するだけという話ではあるが。
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