On Thursday, July 29, 2004, 10:42:40 AM, Jorge wrote:

JA> Has something happened lately (in the last 24-48 hours).

Nothing significant that I can see except for a higher than usual
spike in spam through the evening hours last night.

JA> Normally, I get small amounts (less than 10 a day) of spam that fail to
JA> be detected by my combination of Message Sniffer and Spam Assasin (most
JA> of the times Message Sniffer is the one that get all the messages that
JA> Spam Assasin fail to detect).

JA> Bur since 2 days ago, I've been getting about 60-80 daily, that do not
JA> get detected. I've managed to forward them all to [EMAIL PROTECTED],
JA> but I still keep getting duplicate of the same spam I reported 12+ hours
JA> earlier, even tough my rulebase has updated several times already.

JA> What the reason exactly for this suddent jump in non-detection? Have old
JA> rules been dropped out of the rulebase to get new ones in place?

I've checked your account. It is up to date and it is set to it's
maximum sensitivity (0.1). Nothing special happened in the last 2 days
except that 3 days ago we had a spam storm and generated 757 rules in
one day. The last two days have been 449 and 441.

http://www.sortmonster.com/MessageSniffer/Performance/ChangeRates.jsp

Flow rates look ok too, showing a slight increase in capture rates
(not the decrease I would expect if your conditions were systemic).

http://www.sortmonster.com/MessageSniffer/Performance/FlowRates.jsp

(We're up to 78.3% spam/ham - likely due to the evening hours being
heavier than usual. There are usually day/night cycles in flow rates
starting almost exactly on 00:00:00 and 12:00:00 hours.)

Please check your log files for any errors.

Please also zip up a few examples of the spam that are still getting
through and send them to me at [EMAIL PROTECTED] I will research them to see
if I can find anything special.

We had another recent case like this that was apparently solved by a
change to the update script(s). You say your rulebase has been updated
though - so that's not likely to be the problem. It may be worth a
closer look though just to be sure.

Our rulebase update coverage is nearly round the clock with only a few
hours open - so it would be unusual for a spam to go 12+ hours without
a rule unless there was no way to code a rule that was not too risky
for some reason.

Rules do get dropped periodically - though not for being old. Rules
are dropped from active duty when they stop showing activity - which
is why it is important to submit logs.

It's possible that a rule may have been removed due to a false
positive report... though it would be extremely rare for such a
removal to cause any significant increase in spam leakage. I will know
more when I see your zipped samples.

Hope this helps,
_M





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