What are the possible reasons for an IP address blacklist?

An IP address can be blacklisted due to sending spam, high bounce rates, poor list hygiene, spam complaints, or missing email authentication (e.g., SPF, DKIM, DMARC). Other causes include hosting phishing links, sharing an IP with spammers, sudden volume spikes, or using compromised servers. These factors harm sender reputation and email deliverability.

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