An alternative is that I could keep buying floating IPv4 addresses from OVH until they give me one Microsoft hasn't blacklisted. It's not that expensive but I find the concept ridiculous. I should probably just do this so attestation.app alert emails work for those users.
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If we switch to a new sending IP address, it's possible it will be blacklisted elsewhere.
It's ridiculous since they've never received spam emails from our domains and we have DNSSEC + enforcing DMARC so they can see it's from us. It should bypass a blacklisted IPv4 address.
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They don't support IPv6 so we have to use these recycled IPv4 addresses to send them email. Zero issues with any provider other than Microsoft and Office 365, etc. are fine with us. It's only hotmail.com / outlook.com with their broken IP blacklist system.
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i know a few people who have been stuck on the microsoft block-list for several years now, where even speaking to someone there hasn't helped 😕
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It costs $2.88/month per floating IPv4 address so I could keep ordering them until I get one that isn't blacklisted by Microsoft. I'm unsure what portion of them tend to be blacklisted though and I don't really want to waste a bunch of money buying dozens of these IP addresses.
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Most of the lists other than the UCEPROTECT extortion scam allow you to whitelist your /32 despite them blocking the /24. We have zero issues with anything other than Microsoft's consumer email. UCEPROTECT blocks the entire OVH address space but no one should be using that junk.
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uceprotect.net/en/index.php?m
They have a paid service for whitelisting your /32 within a blacklisted range. Most of the blacklists offer this service without paying by tying it to your domain.
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There's also uceprotect.net/en/index.php?m for paid removal of a /32 and they charge service providers too...
We really don't care about UCEPROTECT though. Our IPv4 address is clean everywhere other than those idiots and Microsoft's consumer email services. It works fine with Office 365 and if it didn't Office 365 actually has a forming form for getting it removed.
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