Getting to many Directory Harvesting attack

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  • Joined: 1/12/2017
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Getting to many Directory Harvesting attack Monday, January 29, 2018 3:46 AM (permalink)
I am receiving to many directory harvesting attacks, They are all blocked, but How can I determine they IP address, and block them at my Firewall.

    • Total Posts : 15
    • Joined: 1/5/2007
    • Status: offline
    Re:Getting to many Directory Harvesting attack Tuesday, January 30, 2018 2:20 PM (permalink)
    This is totally normal. The VAST majority of spam attacks are directory harvesting. They come from all over the world and change IP's constantly. It's a losing battle to try to block at the firewall. Make sure the directory harvesting module is right at the top under filter priority, and that its running in SMTP mode. When it blocks in SMTP mode the overhead on the system is very low. I'm a small user with 3 domains and I block maybe 50,000 a day and the processor doesn't even go above 5% ever.
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