On 2026-06-05 10:47, Jim Garrison via Postfix-users wrote:
On 6/4/2026 14:18, Charles Sprickman via Postfix-users wrote:
Hi all,
[snip]
Received: from [10.88.0.3] (166.161.185.35.bc.googleusercontent.com
[35.185.161.166])
It is extremely unlikely that any legitimate email originates at
googleusercontent.com. I get a dozen or so of these per day on my
personal Postfix server, almost all purporting to be from
[email protected].
I deal with this by blacklisting googleusercontent.com and rejecting all
such emails.
+1
I run a honeypot-fed dnsbl and droplist. When applied to my mail flows,
it reliably catches mail from IPs with .googleusercontent.com rDNS.
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