What causes blocklist listings (technical vs behavioral)?

Blocklist listing causes:

Technical causes:

Compromised server or account sending spam

Open relay being exploited

Malware infection

Poor network hygiene

Behavioral causes:

Sending to purchased or scraped lists

High complaint rates

Spam trap hits

Ignoring unsubscribes

Deceptive content or practices

Hybrid causes:

Compromised forms adding bad addresses

Poor list hygiene allowing trap accumulation

Volume spikes from automation errors

Investigation: Determine which category caused your listing to implement appropriate fixes.

Was the ship hijacked (technical) or carrying illegal cargo (behavioral)?