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The major US-based systems and services supplier I worked for 20 years ago had for a while a filter that correctly blocked emails containing profanities and strong language. The fun part was that it helpfully appended to the bounced email a list of words that could have caused the block, hence the sender was helpfully presented with that same list of the worst (best? hardest? strongest... yh) words that weren't allowed. Yes - c**t was in there, in full.