Deliverability Rate
The percentage of emails that successfully reach the recipient's inbox (not spam or bounced).
Deliverability rate measures how many of your sent emails actually land in the inbox. A 95%+ deliverability rate is excellent for cold email; anything below 85% indicates problems.
Factors affecting deliverability: sender reputation, authentication (SPF/DKIM/DMARC), email content, sending patterns, list quality, and engagement metrics. All of these need to be optimized for consistent inbox placement.