Superhuman, an email app that raised $33M in June, adds read receipt tracking pixels to outgoing mail and doesn't let users stop image loading on incoming mail
Over the past 25 years, email has weaved itself into the daily fabric of life. Our inboxes contain everything from very personal letters …
Context & Ripple Effects
Six days after Superhuman's $33M Series B led by Andreessen Horowitz at a $260M valuation, Mike Industries documents that the $30/month client silently inserts read-receipt tracking pixels into outgoing mail and gives users no way to stop images loading on incoming mail — meaning both senders and recipients are tracked by default.
The post lands while Superhuman has fewer than 15,000 users but outsized venture attention, making it a test case for whether a premium, invite-hyped email client can ship surveillance features as 'speed' tooling without consequence.
First-order effects
- Every recipient of a Superhuman-sent email has their opens, times, and locations recorded without notification, while Superhuman users themselves cannot opt out of loading inbound tracking pixels from other senders.
Second-order effects
- Superhuman is forced into a public retreat within two days — [[a:943460|removing location tracking, deleting location data, turning read statuses off by default, and building a remote-image disable option]] — converting a growth story into a privacy-defaults story mid-funding cycle.
- A July 9 follow-up finds spying still possible after the fixes, since recipients remain unaware their actions are tracked, keeping pressure on the company and inviting scrutiny of read-receipt practices across other email clients.
Third-order effects
- If the pattern holds, recipient-side consent becomes a baseline expectation for email clients rather than a sender-side feature, forcing productivity-focused apps to choose between tracking-driven differentiation and privacy defaults — with investors now exposed to that tradeoff, as Superhuman's later rounds show it still charging $30/month without a formal launch.
The trend: Premium email clients are being pushed to treat recipient privacy defaults as a product requirement, with venture-backed entrants learning that tracking features can no longer ship quietly.