When "High Flight" had this condition,
* ^Received:[.ch>$]
Paul Chvostek responded,
| Um, no... As I was forcibly taught recently, square brackets indicate
| a *range*, so the above condition would match *every* email that came
| in with a Received line in the headers.
As Dallman Ross started to explain, it would not. Periods and dollar signs
are literal if they're inside brackets, so there would be a match only if a
Received: header had, immediately after the colon with no intervening space,
a period, a c or a C, an h or an H, a right-side angle bracket, or a dollar
sign. Almost always there will be a space or a tab there, and if the
whitespace character is missing the next character is sure to be an f (the
first letter of "from"), so that condition will pretty much never match any
message at all.
Square brackets indicate a *group*; a hyphen inside square brackets (with
exceptions) indicates a range.
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