How is the Sender Health Score calculated?

Health Score Calculation

Health scores are calculated based on three weighted factors:

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

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

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

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

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

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

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: 08/05/2025