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IP Reputation Management

The phase nobody warns new senders about: the first six weeks on a new IP, when reputation has not yet stabilised and inbox placement settles into a 70-80% valley before climbing back to 90%+. This category covers IP warming protocols (week-by-week schedules calibrated by destination ISP), feedback loop setup (JMRP for Microsoft, Yahoo FBL, Google's Postmaster Tools), the dedicated-versus-shared-IP decision (the 50K/month volume floor), and how to recover when an IP gets listed on Spamhaus.