Thanks for your feedback.
Feedback?To ensure you receive all important notifications from Cisco Webex without interruption, please update your mail server/firewall settings and SPAM filters. This will prevent critical communications from being delayed or incorrectly marked as SPAM.
Allow Emails from SPF Records
Configure your mail servers to accept emails from Sender Policy Framework (SPF) records associated with Cisco Webex. This step helps validate the authenticity of the emails.
Adjust SPAM filters
Allow emails from the CIDR address ranges used by Cisco Webex mail servers to prevent important notifications from being marked as SPAM.
Subnets/IPs to Add for Whitelisting
- Webex Meetings
- Europe Region: 23.89.104.144/28 and 23.89.123.0/28
- US and other regions: 23.89.3.64/28 and 144.196.251.16/28
- Webex Messaging, Calling, and Others
- Follow the SPF record flow for mail server IPs (i.e., allow based on SPF DNS lookups rather than fixed IPs).
Edge Connect Routing Recommendation
For customers using Webex Edge Connect, which provides direct private network peering to the Webex backbone, it is strongly recommended to advertise your public-facing network components, including DNS and Mail servers, over the Edge Connect link to prevent asymmetric routing issues that can block the services, improve overall service reliability and performance, and enable seamless failover to Internet routing during Edge Connect outages, thereby maintaining optimal network behavior and continuous service availability.
Note: The IP addresses and CIDR ranges listed on this page may change over time. Using the SPF record method is the best way to ensure seamless communication.
We recommend subscribing to this page for notifications to stay informed of any future changes.
