IP address blacklisted 3 times last week

Question

Hi MS Community,

We have a dedicated IP address from Azure 4.234.199.91.

During the last 3 weeks this IP address was blacklisted by spamhaus 3 times.

https://www.spamhaus.org/query/ip/4.234.199.91

After contacting their support, they mentioned the following:

---

Thank you for contacting Spamhaus CSS Removals,

The issue in this case is the neighbourhood and the real solution is for
the provider to make behaviour like "get a new IP every five minutes"
really difficult.

In the same /24 there are a significant number of spamming IPs and this
has a detrimental effect on any other IPs in the same sub-net.

While this IP is being removed, we cannot rule out a repeat due to this
egregious behaviour. You may wish to ask your cloud provider how they
plan to combat this persistent abuse of resources.

---

Is there a way Microsoft deals with this? Any recommendations are welcome.

Regards,

Unitu

Answer 1

Hi,

I will suggest you to review the whitelisting process over here for the Azure IP addresses - https://learn.microsoft.com/en-gb/microsoft-365/security/office-365-security/connection-filter-policies-configure?redirectedfrom=MSDN&view=o365-worldwide