How does sending from a subdomain help with email reputation?

Sending emails from a subdomain helps with email reputation primarily because it isolates the reputation of the subdomain from that of the main domain. This isolation means that if the subdomain experiences issues, such as being flagged for spam by recipients or ISPs, the main domain is not directly affected. This allows marketers to maintain a positive reputation for their primary domain while experimenting or segmenting different email campaigns through the subdomain.

This practice is particularly beneficial for brands that manage multiple email campaigns or segments, as it provides a layer of protection. In case a specific email campaign underperform, perhaps due to a high complaint rate, the main domain’s reputation remains intact, reducing the risk of overall deliverability issues.