How to test for “silent junking”?

Seed testing:

• Maintain test accounts at major providers
• Send test emails
• Check inbox and spam folders
• Document placement

Real recipient verification:

• Ask trusted recipients to check spam
• Internal team members at various providers

Metric analysis:

• Compare open rates by provider
• Dramatic drop at one provider indicates silent filtering
• Zero engagement suggests spam placement

Panel data:

• Third-party services tracking real inbox placement
• Provides visibility beyond your seeds
• Test shipments reveal where cargo actually ends up.