Part of me wonders if someone has added something nefarious into their backend which just collects and exfiltrates new emails as people sign up.
Is it possible that they are somehow leaking the address to actual spammers?
For example, they (or the hypothetical email validation SaaS) use an infected email validation library that ex-fills every email supplied to it, or something like this.
It's likely that the email the author received is pure coincidence. Especially if they are using a client that downloads emails in batches.
FWIW it looks like their validation email is sent by Customer.IO via Mailgun. Both have squeaky clean service agreements so it's unlikely they are shooting off the data to spammers.
Edit: No way! I did end up getting a random empty email. From a "Adventure-Meter Department" at bugbusterbrigade.com. The topic of the email was "Scents and Memory".
This is a really weird email. It's not a spam email, it's some sort of attempt at inbox testing. Perhaps it's an attempt to sniff out AI agents signing up for their service?
curl --request POST --data '{"email": "pangramdemo@milek7.pl"}' https://www.pangram.com/api/validate-email
Date: Tue, 23 Jun 2026 21:58:04 +0000
From: "Winwin Info" <braxton@openheimdallwatcher.com>
To: <pangramdemo@milek7.pl>
Reply-To: <braxton@openheimdallwatcher.com>
Subject: Have you heard of Asiconops?
Message-ID: <T8IRB0S9B4LTQNPIPS5K@openheimdallwatcher.com>
Precedence: Bulk
MIME-Version: 1.0
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: base64
DKIM-Signature: a=rsa-sha256; b=Nlv8wy4vb4DUCqlapZzH6ZaxxA5S7x5uH5+DSwhq844Volt4XNhmwjUn21NHk3W2djCxUf/qxpx9mSkaEQ7unZktzstKioiovFAq1QvTI6l88xbxVKy7n4jnoOH9Z0iHc516a3sx706mjNR7qsUS0qy6I8++S0siDGUiDnf0E8wvaAd6AcZJg1kSmLE+FQz4GeJxq6YKbyLipBDRIGcHU4hanqfer8wV9uHQuT17eQWSsbPvhe3m/+dEfK5M7fNcsVQbgtbDDL+OMzglQefRz4+utbV5yrsjNGFhMRtOho+Fe/WejrhtzDR4uWOlLNaj5VITgebfXtdCVJqv/cOBMA==; c=relaxed/relaxed; s=default; d=openheimdallwatcher.com; t=1782251884; v=1; bh=tGAKIi7xcwVwEFRp5JGIVonxbyuKQlpoEESTP45Uaks=; h=date:from:to:reply-to:subject:message-id:precedence:mime-version:content-type:content-transfer-encoding;
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IDwvaHRtbD4=
bstsb•1h ago
> Hi there, A magnetic domain is a region within a magnetic material in which the magnetization is in a uniform direction. This means that the individual magnetic moments of the atoms are aligned with one another and they point in the same direction [...]
they sign off the email with a zero-width space set to "font-size: 0" for some reason
tom1337•1h ago
style="position: absolute; left: -9999px; top:-9999px;display: none"
maybe they try to warm up those emails to use them for other "campaigns" later on...
mike-cardwell•14m ago
autoexec•5m ago
gus_massa•34m ago