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Re:Tell HN: Consider listing your contact details by 0des on Friday July 30, 2021 @06:42PM (#28013318)
Also works with tr

    echo "[email protected]" | tr 'rbgfcxz9' 'plehodus'
Re:Tell HN: Consider listing your contact details by kazinator on Friday July 30, 2021 @07:05PM (#28013509)
This version doesn't require the knowledge of any system or programming language:

"To obtain my e-mail address reverse the following text from left to right, letter by letter: moc.elpmaxe@raboof".

Note that grandparent cpach, if you check their profile, is actually relying on the good old (dot) (at) obfuscation system, and not the base64 command they proposed in the comment.