Comment by doubled112
5 hours ago
And sometimes if you do everything right, it still doesn’t work.
Recently I checked the IP against blacklists, waited a few months, did all of the other things, and then found out Microsoft bounces my entire VPS’s IP range. Appealing did not help.
They intermittently block Cloudflare email routing IPs too. All of these security measures and still it comes down to the IP address of your sender.
Is it an el cheapo VPS?
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.
You can't have the cake and eat it too.
Either you use cheap infrastructure that attackers can buy by the bulk for sybil attacks.
Or you pay a reasonable price for a slice of an IP block that doesn't share its reputation with elcheapos.
I would simply like to point out that 550 at SMTP time is not a bounce.
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