On 2026-09-09 Ralf Hildebrandt via Postfix-users wrote:
> I just created a little statistic about rejections on my main
> mailserver and found this:
>
> # awk '/postfix\/postscreen.*550 5.5.1 Protocol error/ {print $8}'
> /var/log/mail.log| awk -F: '{print $1}' | sort | uniq -c | sort -n |tail
> --lines=25 | jdresolve --nostats --anywhere -
> 10 [57.77.85.136.bc.googleusercontent.com]
> 10 [178.233.148.34.bc.googleusercontent.com]
> 11 [241.135.114.136.bc.googleusercontent.com]
> 13 [213.102.87.34.bc.googleusercontent.com]
> 17 [249.70.67.136.bc.googleusercontent.com]
> 21 [204.57.148.34.bc.googleusercontent.com]
> 27 [146.58.7.34.bc.googleusercontent.com]
> 29 [38.185.196.104.bc.googleusercontent.com]
> 30 [154.107.171.34.bc.googleusercontent.com]
> 31 [176.63.255.35.bc.googleusercontent.com]
> 35 [223.62.231.35.bc.googleusercontent.com]
> 65 [226.229.139.34.bc.googleusercontent.com]
> 65 [161.204.21.34.bc.googleusercontent.com]
> 100 [194.122.83.34.bc.googleusercontent.com]
> 100 [5.13.221.35.bc.googleusercontent.com]
> 126 [70.164.91.34.bc.googleusercontent.com]
> 161 [234.118.158.34.bc.googleusercontent.com]
> 176 [189.95.80.34.bc.googleusercontent.com]
> 182 [87.147.169.34.bc.googleusercontent.com]
> 190 [215.90.245.35.bc.googleusercontent.com]
> 225 [158.215.197.104.bc.googleusercontent.com]
> 251 [126.237.23.34.bc.googleusercontent.com]
> 279 [255.183.66.136.bc.googleusercontent.com]
> 748 [254.181.148.34.bc.googleusercontent.com]
> 1382 [149.33.148.34.bc.googleusercontent.com]
>
> This very much looks like crap, but WTF is going on?
That's just Google continuing to become the largest spam platform on the
planet. They care so little that I've started blacklisting (as in
firewall-blocking) several of their network ranges that turned into
persistent spam sources.
Regards
Ansgar Wiechers
--
"Abstractions save us time working, but they don't save us time learning."
--Joel Spolsky
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