On Fri, Jul 13, 2007 at 03:20:12PM +0200, Matus UHLAR - fantomas wrote: > On 13.07.07 09:15, Matt Kettler wrote: > > It should only match a missing header.
"missing header" doesn't mean "the header doesn't exist", btw. It's a subtle
difference, please see below.
> bug 5207 should be reopened then...
Nope.
I'll try to keep it short, but here's what's going on:
A header is parsed as:
"[header_name]:[optional_whitespace][header_data]"
The header "exists:header_name" test really converts into:
header_data =~ /./
which requires that there be a character in the header_data.
MISSING_SUBJECT is the inverse of the "exists:Subject" rule, made using
a meta rule.
If the Subject header is actually missing, then there is no header_data, and
therefore the "/./" test fails.
If the Subject header exists, but has nothing but whitespace after the
colon ... there's no header_data, and therefore the "/./" test fails.
I'll put this in the bug for future reference. :)
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