Yahoo! has implemented changes in how it ranks sender reputation for those using multiple “from addresses.” As an email marketer, the changes have a direct impact on deliverability to subscribers using Yahoo! mail, so here’s a quick overview of the changes and how to be prepared for it. What are the changes? Yahoo! has changed its requirements for designating sender reputation. It now uses the “from name” in addition to the sending domain name and IP address to determine inbox placement. In the past, sender reputation was determined using just the domain name, no matter what the “from name” was to the left of it. Now, Yahoo! is keeping a separate reputation for each combination, which could result in different inbox placement even though the messages are sent from the same sending domain name and IP address. For example, “news@company.com” and “newsletter@company.com” will now have separate reputations, when in the past, anything using “@company.com” would have been given the same reputation. In addition, Yahoo! is now designating unique reputations to each combination of “From Name + Domain Name + IP Address.” So, if you use two different IP addresses to send messages from “news@company.com,” then Yahoo will assign a separate reputation to each stream. Why the changes? ISPs continue to implement changes to combat SPAM and prioritize incoming messages for its users, and this is no exception. Marketers often use different “from names” to send to different segments of their lists, and Yahoo! is wanting to reward segments that establish positive reputations while punishing those that don’t meet expectations. How does this affect email marketers? As a marketer, your sender reputation for your primary domain has a major influence on deliverability. While you’re likely already monitoring sender reputation for your domain and IP address, it’s now equally important to monitor reputation for each “from name” as well. Like with most changes that affect email deliverability, the bottom line is to strictly maintain best practices in all facets of your email marketing strategy, and to keep a close eye on deliverability data to be able to take action as quickly as possible.