Thanks for your feedback.

ANSWER

To receive notifications from Cisco Webex Calling services, configure your SPAM or email filter to allow emails from the following address:  

• *.bcld.webex.com
• *.webex.com

If you can't use wildcard domains, please use these specific domains for our mail servers.
 

Region	Domain
Australia	vmail01-au.bcld.webex.com vmail02-au.bcld.webex.com
Japan	vmail01-jp.bcld.webex.com vmail02-jp.bcld.webex.com
EMEA	vmail01-eun.bcld.webex.com vmail02-eun.bcld.webex.com vmail01-eu.bcld.webex.com vmail02-eu.bcld.webex.com
US	vmail01-us.bcld.webex.com vmail02-us.bcld.webex.com vmail03-us.bcld.webex.com vmail04-us.bcld.webex.com
Canada	vmail01-ca.bcld.webex.com vmail02-ca.bcld.webex.com