The Notablist Email Technology Inspector can detect over 250 email technologies, including ESPs, ad networks, CRMs, tracking pixels and more. This tool allows you see which of those are used in an email campaign.
This REST API provides a programmatic means of detecting the various technologies used in email campaigns. These detections are the very same ones used by Notablist to process tens of thousands of unique email campaigns each day for the Notablist competitive intelligence service.
Access to the tool and the technology detection API is free for low volume use. For higher limits, please contact Notablist for pricing.