I registered for their Postmaster Tools, which says
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Refer to the help page for more details.
The help page has no useful information. I suspect that I sent too little mail for it to register in their systems at all.Outlook was even worse, and I just told my Outlook users to change providers.
Eventually I capitulated and got Google Workspace, and now everything gets delivered perfectly.
At 25+ years of hosting email through multiple hosting providers, this has been my experience multiple times. To be fair, happening less often with DKIM et al, but those are relatively new inventions.
Worked for a company self hosting famous brand emails. They would get blocked too. Imagine telling the band manager of a famous classic rock band that their email to their label was being rejected due to being black listed for spam.. (cc’ing the managers team)
Stop fooling yourself, it does not work fine. If it did you would not rely on that google outlook or yahoo account
Personal/private/family email can be easily self-hosted. You just need to know a few things to get it set up properly.