Over the last year, the volume of garbage from Google cloud bad actors has become very noisy. Here is a fail2ban filter that has been working well for me with postfix. [INCLUDES] before = common.conf [Definition] _daemon = postfix/(submission/)?(cleanup|smtp(d|s)) failregex = ^%(__prefix_line)s\S+: reject: .* from \S+\.bc\.googleusercontent\.com\[<HOST>\][;:]...
Strategic IT Consulting and Implementation Services