How do I correlate sending changes with deliverability issues?

Document all changes:

• List uploads or imports
• Campaign launches
• Volume changes
• Content changes
• Infrastructure changes
• Segmentation changes
• Create timeline: Plot changes on a timeline with dates.

Overlay deliverability metrics:

• Open rates, bounce rates, complaints
• Postmaster reputation scores
• Blocklist events

Look for patterns:

• Does metric change follow sending change?
• Typical delay is 24-72 hours for reputation effects
• Verify: Does reversing the change improve metrics?
• Plot the voyage against the weather. Which changes preceded the storm?