Cold email glossary
Inbox placement
Inbox placement is the rate at which accepted emails land in the recipient's primary inbox rather than the spam folder or a secondary tab. It measures where messages end up after delivery, not whether the receiving server accepted them.
What is inbox placement?
Delivery and inbox placement are different measurements. Delivery rate counts messages the receiving server accepted, and it is easy to track because the server reports acceptance back to the sender. Inbox placement counts where those accepted messages actually landed, whether the primary inbox, a tab like Promotions, or the spam folder, and no server reports that back. A program can report a near-perfect delivery rate while a large share of its messages sit unseen in spam.
Mailbox providers decide placement per message using sender reputation, authentication results, content signals, and the recipient's own behavior. The same email from the same sender can land in the inbox for one recipient and in spam for another, because providers weigh individual engagement history. That makes placement a moving target rather than a fixed property of a campaign.
Because nothing reports placement directly, senders measure it through proxies and tests. Seed list tests send copies to a panel of monitored inboxes across providers and report where each one landed, which gives an approximation. Google Postmaster Tools shows Gmail's view of a domain's reputation and spam rate. Day to day, most operators watch trends in replies, opens, and bounces, since a sudden drop with no change in targeting or copy usually means placement slipped.
Why it matters in cold email
Placement failures are silent. The campaign dashboard shows emails going out and being delivered, but replies dry up because nobody sees the messages. In cold email, where every send also shapes sender reputation, continuing to send into spam compounds the damage. Catching placement decay early, through proxy metrics and periodic tests, is the difference between a small volume adjustment and weeks of domain repair.
How Sendful handles it
Sendful watches placement signals continuously across every client domain: bounce and reply trends, reputation data, and automated health checks that flag decay early. When signals slip, volume drops and affected inboxes rest until the trend reverses. Because sending runs on dedicated domains we set up for you, your primary domain's placement is never at stake.
How do I check if my emails are going to spam?
Run a seed list test through a placement testing tool, check Google Postmaster Tools for your domain's spam rate and reputation, and watch your own metrics: a sharp drop in replies or opens without a change in targeting usually means placement slipped. Sending a test to your own Gmail and Outlook accounts is a quick spot check, though one inbox is not a representative sample.
What is a good inbox placement rate?
There is no universally measurable benchmark because no provider reports placement directly. Healthy programs aim to land the large majority of sends in the inbox and treat any sustained decline in reply or open trends as a placement problem to investigate. Seed tests give an approximate percentage, but trends matter more than any single reading.
Why do my emails go to spam even with SPF, DKIM, and DMARC set up?
Authentication is necessary but not sufficient. It proves who sent the message; it does not prove the message is wanted. Placement still depends on sender reputation, list quality, volume patterns, content, and recipient engagement. Plenty of perfectly authenticated mail lands in spam because the domain is new, the volume spiked, or recipients complained.
Related terms
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