5. This usage of "if nothing else" is idiomatic, as D_Bye pointed out. In your example "... automated scanning, which every e-mail provider does, for security purposes if nothing else.", …
Nothing but A. Means only A. You don't want anything else. Anything but A. Means that you don't want A. You could have B or C, or maybe even both B and C (and even E if someone …
The writer has been too liberal in his/her idiomatic usage. (as @Oerkelens states, mixed up) If anything ,the government's job is to protect the safety and health of our citizens. …
4. They all mean the same thing, as you note. However: Nothing but implies that the subject (*it) was more overblown than with the lone but, hence the nothing. There is no great difference …
"Nothing particular" is a perfectly well-formed NP, parallel to "nothing unusual". It just happens not to be a familiar expression, and its meaning is derivable from its components. "Nothing in …
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