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What determines if an email lands in the inbox or spam folder?

Placement depends on a blend of authentication, reputation, engagement, list quality, content signals, and historical performance. Mailbox providers evaluate these layers through automated models that learn continuously.

If your domain has strong reputation, clean lists, high engagement, and predictable behavior, inboxing is likely. If not, spam placement becomes more common.

It is like a multilayered harbor checkpoint. A trusted captain passes each gate easily. A questionable one is directed to secondary inspection.