Dizzy Jay explained to Dragoncrest,
When writing rules for headers it is common to start them with
a caret, since each header by definition should appear at the
beginning of the line.
This is an impression I have, which may be wrong:
Even if there's no risk of an appearance of the string later in the
line, the caret speeds things up, because if the text right after a
newline mismatches the rest of the string -- for example, you're looking
for ^Subject:somepattern but the first character in the line isn't S, or
it's Sender: so the second character isn't U -- procmail can just scan
right ahead to the next line without comparing the characters in the
message to the pattern.
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