What’s the relationship between bounces and blocklisting?

Bounces and blocklisting are connected through reputation:

How bounces lead to blocklisting:

High bounce rates signal spam behavior. Reputation services track bounce patterns. ISPs share data about problematic senders. Accumulated negative signals trigger listing.

Spamtrap connection:

Old addresses may become spamtraps. Sending to them bounces or worse, gets monitored. Spamtrap hits often lead directly to blocklisting.

Blocklist criteria:

Different lists have different thresholds. Some focus on spamtraps. Others consider overall bounce patterns. Reputation aggregators combine signals.

Prevention:

Maintain low bounce rates. Remove addresses promptly. Never use purchased lists. Validate addresses at collection.

Bounces are warning shots before blocklisting. Heed them before the full blockade begins.