The Complete Guide To SPF Flattening For Office 365, Google Workspace, And Saas Senders
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**Executive summary:** This guide explains SPF flattening as a method to avoid the SPF 10-DNS-lookup limit by resolving include statements into explicit ip4/ip6 ranges, and covers discovery of senders, consolidating ranges, publishing flattened records, handling IP churn, TTL/change-control, monitoring (MxToolbox, Mailflow), DMARC/DKIM alignment, rollback procedures, and governance to maintain email deliverability and DNS compliance.
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