The infrastructure math behind any serious campaign: contacts to touches to sends per day to inboxes to domains.
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Thirty sends per inbox per day keeps every inbox inside the envelope of a busy human, which is the whole disguise. Two to three inboxes per domain contains the blast radius when one domain has a bad week. Our best documented month, 162,867 sends, ran on exactly this math: around 110 inboxes across 40 to 50 domains, with the client's primary domain never touching a single send.
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