How can compromised accounts damage sender reputation?

Spam sending: compromised accounts send spam, generating complaints and spam trap hits. This damage affects the legitimate sender's reputation, not just the attacker.

Blocklisting: high-volume abuse from compromised accounts triggers blocklisting. Even after recovering the account, blocklist entries may persist.

Long-term impact: reputation damage takes time to recover. Compromised accounts can undo months or years of positive reputation building. Prevention is far easier than reputation recovery.