Bounce rate management is critical for email deliverability. PostMTA has sophisticated bounce handling that outperforms traditional cloud email services.
The Problem with Cloud Email APIs
Services like SendGrid charge per email and can suspend your account if bounce rates exceed 5%. PostMTA gives you tools to manage bounces proactively.
PostMTA's Bounce Features
- Automatic Bounce Classification: Parses bounce codes from Gmail, Microsoft, Yahoo, and hundreds of other ESPs
- Suppression Lists: Automatic list of invalid addresses that won't be retried
- Feedback Loops: Integration with Gmail and Microsoft complaint feedback
- Real-Time Alerting: Get notified when bounce rates spike
Hard vs Soft Bounce Handling
- Hard bounces: Immediately suppressed, address removed from active lists
- Soft bounces: Retried with exponential backoff, then promoted or suppressed based on ESP-specific rules
Results
With proper PostMTA configuration, bounce rates typically stay below 2% for validated lists.
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