What is a cold email deliverability score?
A cold email deliverability score measures how reliably your outbound emails reach the inbox rather than spam. It factors in domain reputation, SPF/DKIM/DMARC setup, bounce rates, spam complaint rates, and sending volume patterns. OnyxSend monitors deliverability across every sending domain in your account so sequences stay healthy at scale. A score above 85 typically sustains reply rates of 8-15%; anything below 70 kills pipeline before prospects ever read your message.
Evidence and detail
- Domains with SPF, DKIM, and DMARC properly configured see up to 3x higher inbox placement versus unauthenticated senders.
- Bounce rates above 5% trigger spam filters at major providers, reducing deliverability scores and throttling send volume.
- Campaigns with deliverability scores above 85 generate 40-60% more qualified replies per 1,000 prospects contacted.
Related reading
- /blog/how-to-warm-up-a-cold-email-domain
- /blog/spf-dkim-dmarc-setup-guide-for-cold-outreach
- /blog/cold-email-bounce-rate-benchmarks
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