On Mon, May 31, 2004 at 12:15:14PM -0400, Scott Ehrlich wrote: > I have discovered that the headers of legit emails contain a line: > Status: R > whereas spam contain: > Status: (no value) > > What is the safest way to filter on a variable (Status) which has no > value?
Three things.
1) "Status: R" is from your MUA when, IIRC, you read a message.
Messages do not typically come in with a Status line already.
2) if you want some statistics, of the 25k spams I received on the 29th,
9 of them have a Status header, probably because they were opened for
some reason. that's roughly 0.03%. it's roughly the same value for
the last week, btw. if I look at my backup incoming mail folder, which
skips a large percentage of the incoming spam, the percentage of "has
Status header" rises to ~0.25%, but I do usually end up going through
there and reading/replying to mails, so ...
3) If you want to make a rule to catch a blank header, you could do
something like:
:0
* ^Status:[ ]*$
Which will match if there is a Status line with no value section, but
in this case I wouldn't bother since you're not going to hit anything.
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