Exporting raw headers by email client
Gmail (web)
Open the email → click the
⋮ menu (top-right) → Show original → copy all text.Outlook (web)
Open email → click
⋯ (More options) → View → View message source. Copy the header block at the top.New Outlook (desktop, 2023+)
Open email → click
⋯ (More options) in the toolbar → View → View message details. Copy all text from the dialog.Classic Outlook (desktop)
Open email →
File → Properties. Copy from the Internet headers box at the bottom of the dialog.Apple Mail
Open email →
View → Message → All Headers (or ⌥⌘H) → View → Message → Raw Source.Thunderbird
Open email →
View → Message Source (Ctrl+U). Headers are at the top.Yahoo Mail
Open email →
⋮ menu → View raw message. Copy the header section.Proton Mail
Open email →
⋮ menu → View headers. Copy all text from the dialog.Fastmail
Open email → click
More → Show raw message. Copy the top header block.Email Header Analysis Report
Summary
Authentication
Spam Signals
Routing Path