Beginning July 16th, 2023 for Splunk Observability Cloud and July 24th, 2023 for Legacy Rigor Platform, we will be transitioning to new email server IP addresses for delivery of alert event email notifications. This is to improve the overall resiliency of email delivery. Please be advised that any settings you may have in place that allows inbound email from Splunk Observability Cloud ( @signalfx.com ) and Legacy Rigor Platform ( @rigor.com ) must include the new IP addresses mentioned below to ensure email delivery.  These settings may exist as allow/deny lists, firewall rules, etc, and may be configured and managed in your inbound email servers, within your email provider, and/or a third party tool like Proofpoint. Splunk Observability Cloud Email Servers Currently in Use IP Address Hostname 149.72.173.63 o1.ptr616.signalfx.com   Starting July 16, 2023 IP Address Hostname** Additional Information 149.72.173.63 o1.ptr616.signalfx.com to be phased out starting Aug 1st, 2023 159.183.115.130 *.ptr616.signalfx.com   159.183.68.108 *.ptr616.signalfx.com       Legacy Rigor Platform Email Servers Currently in Use IP Address Hostname 198.37.155.75 o1.email.rigor.com   Starting July 24, 2023 IP Address Hostname** Additional Information 198.37.155.75 o1.email.rigor.com to be phased out starting Aug 1st, 2023 159.183.198.43 *.email.rigor.com     ** Subdomain value is subject to vary as indicated by * Please visit https://docs.splunk.com/Observability/get-started/support.html on how to reach Splunk Observability Cloud support with any questions. ... View more