On 2026-09-08 23:00, 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]
[snip]

100% bot traffic.  You can safely reject .bc.googleusercontent.com.

a little joke: bc = bot, certainly
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