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Overview

Mailbox Health is a monitoring feature that tracks the status and deliverability of your connected email mailboxes. It helps ensure your outbound emails reach recipients successfully by monitoring authentication setup, sending reputation, and domain configuration. Maintaining healthy mailboxes is essential for successful email outreach campaigns and sequence performance, as poor mailbox health directly impacts deliverability rates and can lead to emails being marked as spam. Mailbox health monitoring works alongside email verification and sequence performance tracking to provide a complete view of your email outreach effectiveness. Regular maintenance helps protect your sender reputation and ensures consistent campaign results. Health scores help you:
  • Identify mailboxes with deliverability issues
  • Make informed decisions about which mailboxes to use
  • Take corrective action before reputation damage occurs

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Why Mailbox Health Impacts Deliverability

Mailbox health directly impacts your email outreach success and sender reputation. Healthy mailboxes achieve better inbox placement rates, meaning more of your emails reach recipients’ primary inboxes rather than spam folders. Poor mailbox health can cause emails to be blocked or filtered, reducing campaign effectiveness and potentially damaging your long-term sending reputation. The health monitoring system provides early warnings about deliverability issues before they affect your campaigns, allowing you to take proactive action to maintain consistent outreach performance.

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How Reevo Measures and Displays Mailbox Health

Mailbox health is displayed throughout the platform with color-coded indicators and scores on a 1-10 scale. You can view health status in the mailboxes list, individual mailbox details pages, and sequence settings. The system automatically monitors your mailboxes and provides specific recommendations based on health levels. Health scores are calculated from domain reputation, warm-up progress, engagement metrics, and sending patterns, giving you a comprehensive view of each mailbox’s deliverability performance.

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Mailbox Health States

The mailbox health system uses five primary health statuses to indicate deliverability performance:

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Primary Health States

  • Excellent - Score 9-10 (green indicator) - Optimal performance
  • Good - Score 6-8 (green indicator) - Healthy performance
  • Poor - Score 4-5 (amber indicator) - Needs improvement
  • Critical - Score 1-3 (red indicator) - Requires immediate attention
  • Unavailable - For connected mailboxes (gray indicator) - Cannot be monitored

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Special Display States

  • Warmup complete - When a mailbox is ready but hasn’t sent sequence emails yet
  • Pending - When the mailbox is still being analyzed
  • (dash) - When the mailbox is warming up or opted out of warmup

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Monitoring Mailbox Health

  1. Navigate to Settings → @ Email Set Up in your account
  2. Select the mailboxes tab
  3. View your mailbox health status displayed with color-coded indicators Mailbox Health Status
  4. Review any warnings or recommendations for improvement
  5. Follow suggested actions to resolve identified issues
  6. Monitor health metrics regularly to maintain optimal deliverability

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Using Mailbox Health to Improve Deliverability

Based on your health score level, follow these specific recommendations: For Excellent (8-10) or Good (6-7) health:
  • Continue current sending practices
  • Monitor deliverability trends
  • Maintain engagement levels
For Poor (4-5) health:
  • Review email content and templates
  • Reduce daily sending volume
  • Clean email lists and remove bounces
For Critical (1-3) health:
  • Pause all outbound email campaigns
  • Contact support for urgent assistance
  • Implement mailbox warmup process
The system provides automated monitoring and alerts when health scores drop, enabling quick response to deliverability issues.

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Troubleshooting / FAQs

Common causes include missing authentication records (SPF, DKIM, DMARC), high bounce rates, or sudden increases in sending volume. Check your domain configuration and recent sending activity.
Green indicates good health, yellow shows potential issues requiring attention, and red signals critical problems that may prevent email delivery. Each status includes specific recommendations.
Review your mailbox health weekly and before launching new email sequences. Also check immediately if you notice unusual delivery patterns or engagement drops.
Yes, unhealthy mailboxes can cause sequence emails to fail delivery, reducing campaign effectiveness and potentially harming your sender reputation long-term.
Mailbox health focuses on individual email accounts, while domain health covers overall domain configuration and authentication. Both impact deliverability but address different aspects.
Health scores appear as “Pending” when the mailbox is still being analyzed. Scores are calculated based on deliverability factors and engagement metrics.