Beginning in June 2025, Comcast’s Xfinity email service will transition to Yahoo Mail, making Yahoo the second-largest consumer mailbox provider in the US. Existing Comcast users will retain their addresses and data but will access their email through Yahoo’s platform, requiring updated settings for third-party clients and reconfiguration of forwarding/filters. For email marketers, this means treating Comcast addresses similarly to Yahoo addresses, anticipating Yahoo’s deliverability policies (including potential TS03/TS04 errors), and leveraging Yahoo’s sender tools. This shift reinforces Yahoo’s growing presence in the email landscape.
