PostMTA Blog

Bounce Rate Reduction: Enterprise Email Delivery Guide

Bounce rate is one of the most critical metrics in email delivery. Above 2% and your sender reputation suffers.

Types of Bounces

Hard Bounces — Permanent failures:

• Invalid email address
• Domain no longer exists
• Recipient server blocked

Soft Bounces — Temporary failures:

• Mailbox full
• Server busy
• Message too large

PostMTA’s Bounce Management

PostMTA automatically categorizes bounces and takes action:

# Configure bounce rules via API
POST https://api.postmta.com/v1/bounce/rules
{
  "hard_bounce": {
    "action": "remove",      # Remove from list
    "retry_count": 0
  },
  "soft_bounce": {
    "action": "retry",       # Retry up to 72 hours
    "retry_count": 3,
    "retry_interval": "1h"
  }
}

Best Practices

1. Validate emails at signup — Use real-time syntax + MX validation
2. Honor unsubscribe immediately — Removes junk addresses fast
3. Monitor complaint rate — Keep below 0.1%
4. Warm up new IPs gradually — Sudden volume kills reputation
5. Remove inactive subscribers — 6+ months no engagement

PostMTA’s AI-powered bounce analysis identifies problem sending patterns before they damage your reputation.

Reduce your bounce rate with PostMTA →