Almost all cloud providers with dynamic-load ephemeral IPs will show up on ban lists eventually due to vulnerability scanners, bad spiders, and spam/voip drops. However, it is far more common for Spamhaus free tiers to quietly go sideways when no one is looking.
Gmail/Outlook have their own peer policies that serve their own business posture. Google does require administrators register in their clown system as a user to exchange email, but it is effective policy that adds nuisance cost to people spinning up 30 servers a day to spam people.
Firewall Rate-limits are effective on small single-domain servers. A modern email server in Go that is isolated from each user space greatly simplifies the possible setups. =3
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.
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.
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.
Getting a dedicated server with an ISP that does a decent job at keeping their IP blocks clean for email is about the best you can expect. Setup the appropriate SPF/DKIM/DMARC and get along. There's really not too much more to be done these days. Even the big guys don't always get along.