Question 1

How do I inspect competitor email HTML?

Accepted Answer

Forward a competitor email to yourself, save it as EML, then paste the raw HTML into X-Ray. It reveals: hidden tracking pixels, UTM parameter structures, ESP being used (Klaviyo, Mailchimp, HubSpot), link tracking domains, image CDN sources, personalization merge tag syntax, and dynamic content structures.

Question 2

How do I find out what ESP a competitor uses?

Accepted Answer

X-Ray detects the ESP by analyzing return-path addresses, DKIM signing domains, image CDN hostnames, and link tracking URL patterns. Most ESPs have distinctive fingerprints — for example, Klaviyo uses trk.klaviyomail.com for link tracking and images.klaviyomail.com for image hosting.

Question 3

Can I see the tracking pixels in a competitor email?

Accepted Answer

Yes — X-Ray scans for 1x1 pixel images, hidden image requests, and JavaScript tracking snippets in email source code. It identifies analytics vendors (Google Analytics, Mixpanel, Segment), CDP pixel fires, and custom tracking implementations.

Question 4

Is inspecting competitor emails legal?

Accepted Answer

Yes — inspecting emails you legitimately received (by subscribing to a competitor list yourself) is completely legal. X-Ray helps you analyze publicly observable technical details of emails sent to you. It does not scrape, hack, or access any systems without permission.

Email Source Inspector Free