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Old 6th October 2008, 11:03
till till is online now
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Is this a problem or potential problem?
No, thats normal. This are just some guys who want to use your server to send spam.

Is there a way to block all attempts from these IP addresses?
There are severla ways, one way is:

/sbin/route add -host reject

Or you take a look at fail2ban and denyhosts.
Till Brehm
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