How to save an email for scanning

Message Loupe needs the original email — either the whole file (.eml or .msg) or just the raw headers. Don't paste the email body or send a screenshot — 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 — that 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: Headers-only alternative: 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: 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: 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)

Drag the email from your inbox onto your desktop. On Windows it saves as .msg; on Mac it saves as .eml.
Drop that file into Message Loupe.
If the file is a .msg and Message Loupe rejects it, switch to "Paste headers" instead.

Headers-only alternative: 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: 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 — 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 — 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.