Sophos Email customers using IP-based mailflow rule connectors must migrate to certificate-based configuration by March 31st. To see if you're affected Click Here.
Hi everyone,
Customers may receive NDRs when sending Outbound emails using *.comcastbusiness.net. These emails will not show in the Central Email logs at the moment.
For more information, please refer to the below article:
[Update]
As of December 27th, 23:20 UTC the issue to and from comcastbusiness IPs is now resolved. If there are any reports of problems for domains with no relation to Comcast, please contact Sophos Technical Support and reference this article.
