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Answer
Maybe
If by changes you mean additions to the file, then yes, this will work. But if you are looking for overwrites, then no, it probably won't be useful to you. See http://aplawrence.com/Unixart/watchdir.html for that sort of thing.
You can watch multiple files, each with its own message, by using MAILPATH instead of MAIL. You need to "unset MAIL", and set and export MAILPATH:
unset MAIL MAILPATH='/tmp/foo/h?"H is changed":/tmp/foo/a?"A has changed"' export MAILPATH
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