Sending emails to thousands of dead public accounts (like old Hotmail or AOL addresses) will trigger spam traps, ruining your domain reputation and blocking future legitimate communications. To proceed effectively with your project, tell me:
Yahoo! Japan holds a unique position, being a major, independent entity (partly owned by SoftBank). Its email service, often associated with a Yahoo! Japan ID, is a staple in the Japanese digital landscape, making it a critical, distinct option from global Yahoo mail. Sending emails to thousands of dead public accounts
: A dominant local provider. Note that professional addresses often follow patterns like [first]_[last]@yahoo.co.jp . being a major