IP reputation so toxic Gmail treats me like a war criminal

OP here. Six months ago I got a /24 from GreenCloudVPS. Clean on paper. RIPE allocation, proper chain of custody, all docs in order.

Then I tried to send email.

Gmail: permanent fail. 550-5.7.1. "The IP address sending this message does not have a PTR record." Fixed that. Next: "This message does not meet IPv6 sending guidelines." I don't even run IPv6 mail. Redirected to /dev/null anyway.

Microsoft: delayed, then failed. No useful SMTP code. Just "access denied." Piped into their support system. EOF.

I checked 40 blacklists. Present on:
| SpamCop (expired, won't delist without "new incident")
| Barracuda (requires "reputation establishment period" of 30 days—already waited 180)
| UCEPROTECT Level 2 (entire /24 because "neighbors behaved badly"—I am the only neighbor)
| Some mystery list Gmail uses that has no public query interface

I have sent 11 delist requests. Redirected to templates. Piped to automated responses. EOF on human contact.

The IP was "clean" when allocated. Previous holder? Unknown. RIPE won't disclose. GreenCloudVPS "has no record."

I am being punished for sins I did not commit and cannot identify. This is what running infrastructure means now. /dev/null as service model.

I had IP from HostHatch before, very toxic also, gmail no like, hotmail no like, yahoo say no, I check history, found before me someone send "hello dear" email 100000 per day, same but different from your case maybe, 6 month is long time, you try warm up slowly?, 10 email per day, 20 email per day, 50 email per day, same but different from cold start, Or maybe just redirect to SES and cry, cheaper than therapy

Hetzner has encountered similar scenarios with recycled IPv4 allocations. My recommended remediation protocol:

• Immediate: Implement outbound SMTP via relay to established IP reputation pool
• 30-day: Submit delist requests with documented allocation history and intended use case
• 90-day: Establish warm-up procedure with major providers (Google, Microsoft, Yahoo)
• Ongoing: Monitor 50+ public and private reputation lists via automated polling

Critical observation: "Clean on paper" from RIPE does not equate to clean in provider reputation databases. Many blacklists operate on temporal reputation decay models where prior abuse incidents degrade trust scores for 12-24 months regardless of allocation changes.

I note that GreenCloudVPS's IP reputation warranty terms (per their published SLA) explicitly disclaim liability for prior holder activity.

(have you tried (and this is going to sound weird (but bear with me))) just... not sending email? (no, seriously) (everyone thinks they need direct delivery (like it's some kind of infrastructure virtue (it isn't))) (I ran mail for a 500-person org (nested forwarding rules (don't ask))) and we gave up (not because we couldn't (we could (barely))) but because the reputation economy (as I mentioned (though I didn't (this is the first post))) is basically a protection racket with better UX

(also) (and I cannot stress this enough) (check the IP at virustotal) (not the domain (the IP)) (you might find it was a C2 node (which explains everything (and nothing (because delisting from "Google internal" is impossible))))

Which OS and what mail daemon version

Protection racket is right

One correction to my earlier post: Barracuda's "reputation establishment" is actually 90 days minimum, not 30. I confused it with Spamhaus. Their form also now requires a paid Barracuda Central account for expedited review, which many miss.

Debian 12, Postfix 3.7. But CreekYing, the daemon isn't the problem. I can telnet to gmail-smtp-in on 25 and get the banner. The rejection happens at DATA stage, after RCPT TO. It's the IP, not the helo or the config.

(the DATA stage rejection (that's the tell)) (Google's SMTP code is a lie (it's not SMTP anymore (it's a reputation API with RFC-821 syntax))) (you could be running sendmail from 1983 (or a Perl script (I have (don't ask))) and it wouldn't matter (the IP is the identity (everything else is theatre)))

GreenCloudVPS Amsterdam is where I got my block too. Same story, different year. I resell to small shops in Romania, they need mail for invoices. I ended up relaying through Mailgun for 3 years until the IP aged out enough to try direct again. Cost me more than the VPS.