How to perform end-to-end header analysis for reputation clues?

Header analysis for troubleshooting:

Key headers to examine:

Authentication-Results: SPF, DKIM, DMARC status

Received: routing path and timestamps

X-Spam-Status: spam scores and rules triggered

X-MS-Exchange-*: Microsoft-specific decisions

What to look for:

Authentication pass/fail

Which server added spam markers

Delay points in routing

Filter rule triggers

Analysis process:

Read headers bottom-to-top (oldest first)

Track message journey

Identify where problems occurred

Note any scoring or classification

Tools:

MXToolbox Header Analyzer

Google Admin Toolbox

Manual review

Cargo manifest stamps show every inspection point and decision made along the route.