What are common root causes of deliverability problems?

List quality issues:

• Purchased or harvested lists
• Old, unengaged addresses
• Spam traps
• Invalid addresses

Authentication problems:

• Broken SPF, DKIM, DMARC
• DNS configuration errors
• Alignment failures

Reputation damage:

• High complaint rates
• Blocklist listings
• Low engagement patterns

Sending practice issues:

• Volume spikes without warmup
• Irregular sending patterns
• Poor segmentation

Content problems:

• Spam trigger words
• Suspicious links
• Poor formatting
• Most problems trace back to one or more of these categories.

Cargo problems, ship problems, captain problems, or navigation problems. Most incidents fit these categories.