Observation: Google is currently the biggest spreader of phishing mails, Cloudflare hides/hosts the phishing sites these mails link to. That's the simple truth on my mailserver since a few weeks. And yes, I manually report every single one of them to no visible avail.
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@jwildeboer @homelab : but we will ban your home mail server because of spam!
same. i do all the SPF/DKIM/DMARC, DNS/rDNS, watch sending rates, etc. but i've been running a mailserver for 30+ years and not been "banned" yet.
have sometimes wound up with 4xx responses (usually greylisting) but it all eventually gets delivered.