Kerry said:
> HI all: I have another question. Using TF. I have found numerous emails
for
> clients trashed because inter est rate or some other spam statment was
> found. This is fine, however in certain cases for certain clients they do
> indeed need those strings in their letter, because it is a valid email
from
> a bank or insurance company. I can remove the string filter from TF, but
the
> inter est rate string had 578 hits in the past few days. So I have to
allow
> 577 spam to go thru my system just so that one person can receive one
single
> valid email?
Well, umm, yes.
Text filtering is only effective when the strings are unusual enough that
there is virtually no chance that they'd occur in real mail. (Or you're
willing to watch the trapped mail frequently enough so that the real stuff
doesn't stay stuck too long. That's what I do with my "inner" copy of TF (on
the "inner" mail server). But 2/3rd of what it catches is good mail, the
"outer" copy having dealt with the real junk.
So strings like "inte rest rate" and "mort gage" are bad, because they have
a significant probability of occurring in real mail.
I personally concentrate on domain filtering, which has the side effect of
being very accurate. The next version of TF will make that much easier. As
long as your customer's bank isn't linking to a known spam site, they'll get
their mail. (And if your customer's bank is also sending spam, well, then
you have a problem!! I'd recommend they change banks, but that's not always
practical...)
I use most of the other filters just to trap spam so it can be inserted into
the domain filters (the URL filter in the current TF). And to handle the
small percentage of spam that doesn't contain any links.
Randy.
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