Hi,
I'm suffering daily attacks from an spam botnet. It isn't always at
same time, but occurs 3-4 times per day, during 10-20 minutes.
When it happen, my server hang up (at network level) with many
SYN_RECV connections and main router is saturated because receives
more connections that can handle.
Any fix?
I'm using this:
:allow,QMAILQUEUE="/var/qmail/bin/qmail-queue.kas3",RBL="",BLOCKRELAYPROBE="",RCPTCHECK="",BADRCPTDELAY="",SANITYCHECK="",SENDERCHECK="",SMTPAUTH="TLSREQUIRED"
Any protection "based on delay" the spammer it's self-defeating, since
keep connections open during more time, will produce more connections
was queued.
Thank you very much.
