[pfx] Re: empty from envelope?

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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