1x1 mail

You're referring to a 1x1 pixel mail!

In the early days of the internet, email was often represented as a simple text-based format, with no images or attachments. A "1x1 mail" was a humorous way to describe an email that was essentially just a single pixel, often used as a placeholder or a joke.

In modern times, the term "1x1 mail" is mostly used in a nostalgic or ironic sense, often to refer to a simple or minimalist email design. However, it's not a common term in everyday usage.

Would you like to know more about the history of email or the evolution of email design?