On Sun August 9 2020 15:52:37 David C. Rankin wrote:
# iptables -nvL --line-numbers Chain INPUT (policy ACCEPT 3651K packets, 548M bytes) num pkts bytes target prot opt in out source destination 11 3074 182K DROP all -- * * 37.0.0.0/8 0.0.0.0/0
Dang. I checked as much as I could of your SMTP and even checked BGP looking glasses but of course I couldn't see your iptables!
You might want to try rate limiting, connection limiting, and fail2ban instead of hard iptables blocks.
--Mike
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