In Singapore the hosting market is small enough that everyone knows which /24s are burned. GreenCloudVPS Singapore IP I had was clean, but I checked first on a local forum before buying. The community maintains informal blocklists because the formal ones are too slow.
IP reputation so toxic Gmail treats me like a war criminal
Shared hosting survivor here. You think escaping to VPS fixes this? The IP reputation problem is worse. At least on shared hosting the hoster was paying for a clean relay IP pool. Now I'm my own sysadmin AND my own reputation manager. 2025 and I miss cPanel.
What about IPv6? Nadia said Gmail complained about IPv6 guidelines even though she doesn't run IPv6 mail. Is there a way to disable IPv6 entirely at the MTA level and force IPv4?
Rack10: I tried. Postfix inet_protocols = ipv4. Gmail still mentioned IPv6 in the bounce. I think they check the AAAA record of the sending domain, not just the connection. My domain has AAAA because the web host does IPv6. The mail path and web path are not separable in their logic.
/dev/null: full of good ideas
harbourops
Member
That is correct. Google's IPv6 policy evaluates the domain's published records holistically. If your domain has AAAA, they expect matching MTA-STS or at least consistent policy. Removing the AAAA record or adding explicit MTA-STS with ipv4-only preference can resolve the mismatch. I have documented this specific scenario with three client migrations.