Thank you, Lisa.  That is a very helpful explanation.

In this case, the example item with a single quote mark in
the subject line went into my trash folder rather than to spam.

Does the fact that this happens (with single quote marks in a
subject line) mean that every item like that goes into either spam
or trash for *every* PLUG forum participant who uses Gmail?

Is there anything I can do to prevent every email (like this one) with
a single quote mark in the subject line from getting trashed or going
into the spam folder?

Thanks again.

Joe

On 10/10/08, Lisa Kachold <lisakachold@obnosis.com> wrote:
>
>  Gmail/google uses the spamav/clamav, spamd and spamassasin rating to
> determine what is spam and what is not.
>
> Part of that is based on their custom signatures, which send to spam folders
> based on "intelligent" format.  This "spamav/clamav" signature is updated on
> their servers hourly (or depending on the conf file).
>
> These rules are run before your filters, and can catch things with "..'.."
> etc.  URI encoding exploits and virus can attach to even the Subject line,
> and are scraped for good reason.
>
> Use the Source Luke - ask Google?
>
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> http://en.wiktionary.org/wiki/obnosis | Obnosis.com
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>
> > Date: Fri, 10 Oct 2008 10:43:45 -0700
> > From: joe@actionline.com
> > To: plug-discuss@lists.plug.phoenix.az.us
> > Subject: OT: Gmail filter errors
>
> >
> > I've searched the 'net and tried Gmail forums, but can't find
> > any help anywhere else, so I'll try the best source, even though
> > this is OT.
> >
> > 1. Every day, I have some legitimate email that Gmail sends
> > to spam, so I still have to go through it every day to retrieve
> > those legitimate items.
> >
> > 2. Having created several hundred Gmail filters to battle this
> > never-ending spam problem (and to try to cut down on the number
> > of emails overrunning the spam folder that I have to scan through
> > every day, I now find that some legitimate email is now getting filtered
> > and sent to trash, also.
> >
> > So, I have been running all kinds of tests to try to figure out why
> > this is happening. One example is a PLUG email that just went
> > into trash with the subject: "OT: I've Been Burgled!"
> >
> > After examining my filters and not finding any that should have
> > caused this problem, I tried sending a dozen different email
> > messages to myself with various combinations of criteria to
> > identify what might be causing the problem. I only have filters
> > set up for From: / To: / and Subject: , so I tried every possible
> > combination of character strings and finally narrowed the
> > problem down to one word in the subject line that causes
> > the errant filtering to trash of this item ... the word: "I've"
> >
> > I do not have the word "I've" in any of my filters. So can anyone
> > suggest any possible reason or remedy for this anomaly?
> >
> > Another very strange thing about this is that when I pull up a
> > list of all my filters and try to do a search for the word "I've"
> > or even "Ive" I get zero hits. However, in the process of testing
> > this, I discovered that when I search for some other words, in
> > my list of filters, I have found that search returns several
> > more hits for some words or names than actually appear in
> > the list. That is really strange.
> >
> > For example, if I search for the name "Greg" search returns
> > five (5) hits, but there are only two occurences of that name
> > in my list of filters. This happens on many other words, also.
> >
> > Hope someone can provide some help with these problems.
> >
> > Google doesn't respond and I can't find any help in any
> > Gmail forum.
> >
> > Joe
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