I'm on a bit of an evil mission here and I'll share it in hopes that
others might want to be evil and join me in it. Here's the details:
Obviously, we can't block Gmail. Can't be done. We can filter by
content, but that is getting harder and harder to do with anything short
of burning LLM tokens to get a "human-like" read on every email, they'll
change content around in virtually infinite ways to get around content
filters. So instead my goal is to make sending spam from networks that
aren't Google or Microsoft so incredibly difficult that spammers realize
there's really only one way to reach my customers with their spam: Send
from Google or Microsoft.
I'm doing this by only allowing mail from whitelisted IPs from every
network out there that sends more spam than ham. That means Hetzner, it
means parts of OVH, virtually every cloud provider out there.
If I can force increased outbound spam from Google and Microsoft,
everyone collectively is going to be circling them with pitchforks to
make spam THEIR problem to solve.
Now this is difficult, because it amounts to basically mapping most of
the internet and separating good senders from not only IPs that aren't
good senders, but even just IPs that don't currently belong to anyone
who has any value as a sender.
Look for "Apply the suspicious range check" in the exim ACL list:
https://github.com/mxroute/da_server_updates/blob/master/exim/exim.acl_check_recipient.pre.conf
Then we have two of the lists here:
https://github.com/mxroute/da_server_updates/blob/master/exim/susranges
https://github.com/mxroute/da_server_updates/blob/master/exim/susranges_whitelist
If we can continue to push spammers to Google, it will make this problem
more and more difficult for them to ignore their role in sending spam to
our networks. So PLEASE, do not stop hounding them about the spam coming
from their network. It's part of my world domination strategy.
Jarland
On 2025-12-13 04:54, Hans-Martin Mosner via mailop wrote:
Response to an abuse report (which naturally contains a spam sample):
<[email protected]>: host smtp.google.com[192.178.156.26] said:
550-5.7.1
[xx.xx.xx.xx 12] Gmail has detected that this message is
550-5.7.1
likely unsolicited mail. To reduce the amount of spam sent to
Gmail,
550-5.7.1 this message has been blocked. For more information, go
to 550
5.7.1 https://support.google.com/mail/?p=UnsolicitedMessageError
xxx-xxx-xxx.186 - gsmtp (in reply to end of DATA
command)
Guess I will need to skip the reporting step and proceed to outright
blocking from the start.
Cheers,
Hans-Martin
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