Email Detective — ESP Tracker (by EmailTooltester)

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Brand	Marketing	Other ESPs	Setup	Obs	Last seen
Beehiiv beehiiv.com ↗	Beehiiv 1643	Customer.io 66 SendGrid 34	85	1743	2026-07-01
Metamail metamail.com ↗	Salesforce MC 57	—	100	57	2026-06-30

Newsletter / campaign platforms, by brand count

SMTP relay / infrastructure, by brand count

Email design tools, by brand count

38 brands ship interactive AMP emails

Averaged across 3,813 brands with 5+ placement observations

inbox 82.2%promotions 16.4%spam 1.4%

Spam placement is mostly driven by the sender (list quality, content, complaints), not the ESP.

21.2% of Outlook opens never fire the sender's tracking pixel (images blocked)

Based on 1,202 opens tracked. Open rates undercount real opens more than most senders realize.

Anonymous, privacy-preserving observations from the free Email Detective extension. Read more