It is a cheap VPS, but it would still be nice if there was a way to know (not assume) beforehand.
> 550 5.7.1 Unfortunately, messages from [IP ADDRESS] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150).
Is Cloudflare a cheapo VPS?
It is a cheap VPS, but it would still be nice if there was a way to know (not assume) beforehand.
> 550 5.7.1 Unfortunately, messages from [IP ADDRESS] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150).
> Your IP(s) qualify for conditional mitigation.
Still blocked. The system is working as expected.
Cloudflare is one of the shadiest hosts around, almost as bad as the big three clouds.
I would simply like to point out that 550 at SMTP time is not a bounce.
You get an email bounce back with an error code in it. Is there some other definition I'm unaware of?
Wait, that is probably from the local mailer, and otherwise the sender may never know about the rejected messages.
5xx are bounces, a perm failure. 4xx error codes are temp (retry) errors.
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