Glossary

Email Deliverability Score

An email deliverability score is a composite metric that estimates the likelihood that emails sent from a given domain or IP address will reach recipients' inboxes rather than being filtered into spam or blocked entirely. It is calculated by analyzing factors including domain reputation, IP reputation, authentication setup, bounce rate, spam complaint rate, and engagement history.

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Email deliverability is not a binary pass/fail — it exists on a spectrum determined by dozens of signals that inbox providers like Gmail, Outlook, and Yahoo evaluate in real time for each sending domain. These signals fall into three broad categories: technical configuration (SPF, DKIM, DMARC records, dedicated IP reputation), sending behavior (send volume, sending velocity, bounce rate, spam complaint rate), and engagement history (whether recipients at that domain open, click, and reply to messages from you — or mark them as spam). Deliverability tools like MXToolbox, Mail-Tester, and Google Postmaster Tools allow senders to audit their deliverability health and identify specific weaknesses. A sender with perfect technical configuration but a 5% spam complaint rate will still see significant inbox placement issues; conversely, a sender with imperfect DNS records but strong engagement history from a well-warmed domain may outperform expectations. The score is a lagging indicator — it reflects accumulated sending behavior, which means it takes time to build and can degrade quickly if practices deteriorate. For outbound sales teams using Outvid's video outreach campaigns, maintaining a high deliverability score is foundational to campaign performance — a personalized video that lands in spam delivers zero value regardless of its quality. This is why Outvid recommends a structured email warm-up process before any new sending domain is used for outreach at scale, and why campaign sending volume should be ramped gradually to avoid triggering volume-based spam filters.

What should I know about Email Deliverability Score?

Authentication Is the Foundation

SPF, DKIM, and DMARC records must be correctly configured before any sending begins. Without proper email authentication, inbox providers have no way to verify your identity and will default to treating your messages with suspicion.

Engagement History Drives Long-Term Score

Inbox providers weight recipient engagement signals heavily. Domains whose emails are regularly opened, replied to, and not marked as spam accumulate a positive reputation that improves inbox placement over time — making early campaign engagement disproportionately valuable.

Warm-Up Is Not Optional

New sending domains have no reputation history. Without a structured warm-up process that gradually increases send volume while generating positive engagement signals, new domains will be treated as spam sources by major inbox providers.

How is Email Deliverability Score used in practice?

A team audits their deliverability score before a major campaign

Using Google Postmaster Tools, the team discovers their domain reputation has dropped to 'Low' due to a batch of emails sent to an unvalidated list with a 7% bounce rate. They pause outbound, clean the list, run a 3-week warm-up campaign, and rebuild to 'High' reputation before relaunching — resulting in 94% inbox placement versus 40% during the low-reputation period.

An SDR sets up a dedicated sending domain for cold outreach

Rather than using the company's primary domain for cold outreach, the SDR sets up a subdomain, configures SPF/DKIM/DMARC, and runs a 4-week warm-up through an automated tool. By the time the first Outvid video campaign launches, the domain has accumulated sufficient positive engagement history to achieve consistent inbox placement with major providers.

Frequently asked questions

How do I check my email deliverability score?

Use Google Postmaster Tools for Gmail inbox placement data, MXToolbox for DNS and authentication checks, and Mail-Tester.com for a point-in-time score of a sample email. Running all three gives you a comprehensive view of your deliverability health.

How long does it take to improve a poor deliverability score?

Reputation recovery typically takes 4–8 weeks of consistent, clean sending behavior. The more severe the reputation damage — particularly from high spam complaint rates — the longer the recovery period. Prevention through good list hygiene is far faster than remediation.

Can sending video emails hurt my deliverability score?

Video files should never be attached directly to emails — they will trigger spam filters and inflate email size. Video email platforms like Outvid instead embed an animated GIF thumbnail that links to a hosted video page, keeping email size small and deliverability unaffected.

Learn more

Cold Email Deliverability Email Warm-up Sender Reputation Email Authentication Sales Cadence How to Build a Multi-Channel Sales Cadence

Launch Video Campaigns on a Healthy Sending Foundation

Outvid's outreach infrastructure is designed for deliverability — so your personalized videos consistently reach the inbox where they can drive real replies.