Why It Matters
ISPs use bounce rate as a key signal when evaluating your sender reputation. A consistently low bounce rate tells them you maintain a clean, permission-based list. A high bounce rate says the opposite. Gmail, Microsoft, and Yahoo all track this metric, and exceeding their thresholds (which hover around 2-3%) can result in throttling, spam folder placement, or outright blocking.
How It Works
After each send, your email platform counts how many messages bounced and divides that by total sent. Most platforms break this into hard bounce rate and soft bounce rate. Hard bounce rate is the more critical metric because it reflects permanent, unresolvable failures.
Industry benchmarks vary by sector. SaaS companies tend to see bounce rates around 0.5-1%. Retail and e-commerce average 0.7-1.2%. Non-profits with older lists may run higher. If you're consistently above 2%, your list needs cleaning.
Quick Tips
- Run your list through an email verification service before large campaigns, especially if you haven't mailed in a while.
- Implement real-time validation on signup forms to catch typos and fake addresses before they enter your list.
- Track bounce rate per campaign and per segment. A high bounce rate in one segment might indicate a bad data source rather than a list-wide problem.