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Segregate the IP addresses you use according to what you use them for. Yahoo! Mail keeps reputation data about each IP address you send from. Consumer reports of spam negatively impact an address’s reputation data. Separating an address that delivers marketing mail from another that sends transactional mail (order receipts or billing notices, etc.) – or from another address that sends mail composed by end users – you make it easier for Yahoo! Mail to determine the IP address’ reputation. This way a delivery decision can be made that will …