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Papercut SMTP 7.7.2, published by PapercutSMTP, is a lightweight developer utility that combines a local SMTP listener with an instant desktop viewer for every message it captures. Designed solely to receive—not relay—mail, the program listens on the configured port, accepts whatever a client application sends, and immediately displays the complete message in its GUI: full body text, rendered HTML, headers, MIME parts, base64-encoded attachments, and raw source bytes. Because no authentication or relay logic is enforced, developers can point any application, script, or device at Papercut and watch the exact e-mail that would have left the machine, making it ideal for debugging contact forms, testing password-reset flows, verifying automated reports, or inspecting attachment encoding without risking spam or data leakage. The viewer opens automatically on arrival, yet the server can also be told to start with Windows and hide in the system tray, popping up only a balloon tip when new mail lands. Seven major versions have appeared since the project’s inception, each refining the parser, memory footprint, and UI responsiveness while remaining portable and configuration-free. The tool belongs to the “Email Servers / Development Tools” category, occupies only a few megabytes, and requires no installation privileges, so it can coexist alongside IIS, Mercury, or hMailServer without conflict. Papercut SMTP is available for free on get.nero.com, with downloads provided via trusted Windows package sources such as winget, always delivering the latest version and supporting batch installation of multiple applications.
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