Sean told Vyacheslav,
| See countless recent posts saying how you DO NOT put variables in braces -
| procmail doesn't use them.
Actually, procmail tolerates them. Usually they're just bulk, but as in
Bourne shell there are two situations where they're needed:
1. When the character immediately following the variable is itself legal in
the name of a variable name, so that ${foo}ds provides a way to say "the
contents of $foo plus 'ds'" if that's what you want, because $foods would
be read as the contents of a variable named "foods."
2. When you make ${var+text}, ${var:+text}, ${var-text}, or ${var:-text}
substitutions.
Otherwise the braces are just bulk and can be dropped.
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