How to save an email for scanning

Message Loupe needs the original email: either a .eml file or the raw headers. It cannot read Outlook .msg or .pstfiles. Don't paste the email body or send a screenshot, since those don't include the hidden routing info we check.

Regular forwarding doesn't work

When you forward an email, your mail program replaces the original headers with your own, which destroys the evidence we need. Either download the original file, or use the "Show Original" / raw headers view and paste those instead. Forward as Attachment (a different feature in some clients, listed below) is fine because it preserves the original intact.

Gmail (in a browser)

Open the email.
Click the ⋮ next to the Reply arrow (the one inside the email itself, not the menu at the very top of the page).
Click "Download message."
Drop the saved .eml file into Message Loupe.

Headers-only alternative: Use the same menu, choose Show original instead, then copy everything from the page that opens and paste it into Message Loupe's Paste headers tab.

Outlook on the web

outlook.office.com (work / school) or outlook.live.com (personal)

Open the email.
Click the ⋯ in the message toolbar.
Choose "Save as."
Drop the saved .eml file into Message Loupe.

Headers-only alternative: Open the email, click ⋯ → View → View message source. Copy the entire window contents and paste into the Paste headers tab.

Apple Mail (Mac)

Drag the email from your inbox onto your desktop. It saves as a .eml file.
Drop that file into Message Loupe.

Headers-only alternative: Open the email, then View → Message → All Headers. Copy the headers block and paste into the Paste headers tab.

Outlook desktop (Windows / Mac)

If Outlook can save the message as .eml, drop that file into Message Loupe.
If Outlook only gives you .msg, switch to "Paste headers" instead.
Open the email, choose File → Properties, and copy everything from the Internet headers box.

Headers-only alternative: Open the email, then File → Properties (Windows) or Message → Internet headers (Mac). Copy the contents of the 'Internet headers' box and paste into the Paste headers tab.

Forward as Attachment: Outlook desktop also supports Forward as Attachment: Home → More → Forward as Attachment. The forwarded message arrives with the original .eml attached.

Thunderbird

Right-click the email in your inbox.
Choose Save As → .eml.
Drop the saved file into Message Loupe.

Headers-only alternative: Open the email, then View → Message Source. Copy and paste the full contents.

Forward as Attachment: Thunderbird supports Forward As → Attachment via right-click on the message.

On a phone?

Phones make this much harder. Two real options:

iPhone Mail. Long-press the message, then choose Forward as Attachment. This is different from regular Forward, and it preserves the original intact. Send to yourself, then open the .eml attachment on a computer.
Gmail on phone. Open gmail.comin your phone's web browser (not the Gmail app), tap the three-line menu, choose Desktop site, then use the Gmail steps above.
If neither works, wait until you're at a computer. Don't regular-forward the email to yourself, since that breaks the analysis.

Don't see your email program? Look for a menu option called "Show Original," "View Source," "View Headers," or "Internet Headers." Copy what you see and paste it into the Paste headers tab on the home page.