Articles on: Email Outreach & Deliverability

How is the Sender Health Score calculated?


Health Score Calculation


Health scores are calculated based on three weighted factors:


  1. Bounce Rate (50% weight)


  • 100 points: < 1% bounce rate


  • 75 points: 1-2% bounce rate


  • 50 points: 2-5% bounce rate


  • 25 points: 5-10% bounce rate


  • 0 points: ≥ 10% bounce rate


  1. Domain Health (25% weight)


  • 100 points: Active domain with no errors or warnings


  • 90 points: Active domain with 1 warning


  • 80 points: Active domain with 2 warnings


  • 70 points: Active domain with 3 warnings


  • 0 points:


    • Inactive domain


    • Blacklisted on Spamhaus DBL


    • 4+ errors


  1. Sender Status (25% weight)


  • 100 points: OK status


  • 50 points: Unknown status


  • 0 points:


    • Invalid domain status


    • Blacklisted status


Score Calculation


The final health score is calculated as a weighted average:


Final Score = (BounceScore * 0.5) + (DomainScore * 0.25) + (StatusScore * 0.25)


Score Range: 0-100


  • 100: Perfect health (all factors at 100)


  • 75-99: Good health (minor issues in one or more factors)


  • 50-74: Moderate health (significant issues in one factor)


  • 25-49: Poor health (critical issues in one factor or multiple issues)


  • 0-24: Critical health (multiple critical issues)


Examples


  1. Perfect Health:


  • Bounce Rate: 0.5% (100 points)


  • Domain Health: Active, no issues (100 points)


  • Status: OK (100 points)


  • Score: (100 * 0.5) + (100 * 0.25) + (100 * 0.25) = 100


  1. Moderate Health:


  • Bounce Rate: 2% (50 points)


  • Domain Health: Active, 1 warning (90 points)


  • Status: OK (100 points)


  • Score: (50 * 0.5) + (90 * 0.25) + (100 * 0.25) = 72.5


  1. Blacklisted Domain (Warming Disabled):


  • Bounce Rate: 5% (25 points)


  • Domain Health: Blacklisted on Spamhaus (0 points)


  • Status: OK (100 points)


  • Score: (25 * 0.5) + (0 * 0.25) + (100 * 0.25) = 37.5


  • Result: Sender remains active but warming is disabled


  1. Critical Health (Multiple Issues):


  • Bounce Rate: 5% (25 points)


  • Domain Health: Blacklisted on Spamhaus (0 points)


  • Status: INVALID_DOMAIN (0 points)


  • Score: (25 * 0.5) + (0 * 0.25) + (0 * 0.25) = 12.5


  • Result: Sender is completely disabled

Updated on: 17/06/2025

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