Find the ESP behind any marketing email.
Curious which email platform was used to send the marketing campaigns in your inbox? Just forward them to firstname.lastname@example.org and we’ll instantly reply with the answer.
ESP Finder is 100% free, just forward any email to:
Top 25 ESPs
Keep in mind that while we current track over 90 ESPs and we're always adding new ones, if we can't identify a specific ESP they won't show up on the list.