MailScanner marks messages as DOS attact

[simon at kmun.gov.kw]

Dear All,

I had this issue for sometime but was confused on where actually this
issue was from..
Many a times mails were stop and being marked as denial from service attack
This was mostly from google groups ..

after more investigation i realized the following..

many of the users have subscribed to google groups ..
now when a email is received from a user who belongs to the same group as
our users belong maybe about 15 to 20 messages are marked clean ..
subsequent messages are being marked with RED and the details page shows
denial of service attack.
Also the System becomes very slow as MailScanner consumes the entire CPU
and also the outgoin email takes long time to reach the recipent.

it remains in the incomming queue for a long time.. maybe 10 to 15 min at
times

Now I would like to know any tips and advices as what i could do to make
MailScanner process these mails at a much better rate and there by avoid
MS marking them as DOS attack mails and there by avoiding the whole system
from being slow.

regards

simon






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