LinkedIn user data leaked: Database shows emails, profile data, phones, full names, and more confidential info.
The same threat actor has leaked larger amounts of data from LinkedIn dated 2023. They claim this new data contains 35M lines and is 12 GB uncompressed.
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That's not because you have a wildcard. That's because you need to implement DKIM, DMARC, and SPF records to prevent others from using your domain name to send mail.
MTAs use those standards to verify if somebody is permitted to send email for your domain. If you don't have those set then you can get what that ISP described.
Well I used a third party service to host my domain, and as far as I can remember (like I said this was over a decade ago, maybe almost two decades), everything was set up correctly at that time.
Not trying to dispute what you said, but I can at least speak towards that as far as we knew at the time we had the domain set up correctly on our end, the stuff we could control.
The only thing is we had a catch-all bucket setting turned on for emails to be forwarded to an internal email address of our domain.
There has never been a correct way to deploy these services, just increasingly complex, featurefull, and or secure ways to do it
You forgot one way.