Hello,
Some times ips like this 144.217.123.236 are listed with this reason:
The host is unauthorized to send email directly to email servers.
But that has no sense, this IP 144.217.123.236 is the main ip of my dedicated server in OVH datacenter (canada),
why is not autorized to send email to other servers? this is not a dinamyc IP or something similar, this IP is the main IP for a business dedicated server.
could you check this please or contact me to solve this asap.
I have other ips blockt too with this reason:
The host has been observed sending spam in a format that is similar to snow shoe spamming techniques.
But there are not spam from that ips, there are secondary ips in some servers assigned to clients that want a dedicated IP, and the email traffic is very low.
i had seen a lot of post in this forums about the same isue, maybe the methods your are using to detect this are not the best.