We wanted an easier way to scan email headers when troubleshooting various issues that we run into with email handling. Email headers come into play when tracking who is involved in a conversation, tying conversations together, detecting spam, and more. Our eyes can get a little watery peering through raw email headers.

This tool accepts a paste of a raw email, then it shows headers and their values in a format that's easier on the eyes. Where possible, definitions are provided for each header. Most of these definitions (and their citations) were gathered by Chat GPT, with some editing by me. Corrections are welcomed!

And, yes, some vibe coding was involved in the creation of this tool.