Email Deliverability
Also called: Deliverability, Inbox Placement, Email Placement
Definition
The ability of an email to reach a prospect's primary inbox rather than landing in spam, promotions, or being rejected outright — determined by domain reputation, technical setup, and sending behaviour.
Email deliverability is the single biggest technical lever in cold email. A campaign with a 90% open rate that lands in the inbox will generate 10–20x more replies than the same campaign filtered into spam. Getting to the inbox requires managing three layers:
1. Technical authentication — SPF, DKIM, and DMARC records must be correctly configured on every sending domain. Without them, major email providers (Google, Microsoft) apply heavy spam filtering. This is table stakes.
2. Domain and IP reputation — Email service providers score every sending domain based on engagement (opens, replies, clicks) and complaints (spam reports, unsubscribes). A new domain starts with zero reputation. It must be warmed over 3–6 weeks with low send volume and gradually increasing frequency before running campaigns.
3. Sending behaviour — Volume spikes, high bounce rates, and low engagement all damage reputation. Best practice: send under 50 emails per inbox per day, rotate across multiple domains/inboxes, and monitor bounce rate closely (keep under 3%).
The cost of poor deliverability
Cold email campaigns with poor deliverability have the same budget and effort as well-deliverable campaigns — but produce a fraction of the results. A 5% inbox placement rate effectively wastes 95% of your campaign investment. Infrastructure is not optional.
Related concepts
Deliverability is downstream of domain reputation, which is managed through email warmup. SPF, DKIM, and DMARC are the authentication records that form the technical foundation.
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