How do I correlate sending changes with deliverability issues?

Correlation analysis process:

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?