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Papercut SMTP 8.0.2

Standalone SMTP server designed for viewing received messages

filecart Windows Updated Nov 09, 2026
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About Papercut SMTP

Papercut SMTP is a 2-in-1 quick email viewer AND built-in SMTP server designed for development.
It allows developers to safely test email functionality without risk of emails being sent to real recipients.

Features:
- Desktop tray app and web UI for viewing emails
- Built-in SMTP server (receive-only)
- Full email inspection (body, HTML, headers, attachments, raw encoded bits)
- Support for running as a minimized tray application with notifications
- WebView2-based HTML email rendering

License: Apache-2.0
Release info Update on Nov 08, 2026
Release notes Release Notes

Papercut SMTP v8.0.2 [2026-11-08]

Bug Fixes
• Old Interface After Updating - After an update, the desktop app or a browser could keep showing the previous version's interface for up to 10 minutes. From the next update on, the new interface loads straight away. If this update still looks like the old version, press Ctrl+F5.

Papercut SMTP v8.0.1 [2026-11-08]

Bug Fixes
• Messages Stuck Loading - Opening a message while the Headers, Body, Sections or Raw tab was selected left the pane on the loading spinner until the window was reloaded.
• Scroll Position - Opening another message now starts at the top instead of keeping the previous message's scroll position.

Papercut SMTP v8.0.0 [2026-11-08]

The desktop app is rebuilt. It's now a tray app that shows the same web UI as the Papercut Service, and it runs on macOS as well as Windows. Updating from v7 is a normal in-place update: your messages, SMTP IP and port, message folders, notification setting and window size all come with you.

Security
• Please Update - In 7.8.0 and earlier, any web page could call the Papercut Service's API, so a site you visited could read or delete your captured mail. Updating to 8.0.0 fixes this.

Before You Update
• Forwarding Rules Don't Carry Over - v7 kept its rules in a folder that updates replace, so they're gone by the time v8 starts, unless an installed Papercut Service has a copy, which v8 imports. Papercut shows a notice once if you need to re-create them under Rules. From v8 on, rules survive updates.
• Other Settings Not Carried Over - Forward dialog settings, theme, sort order and zoom go back to their defaults.
• If You Also Run the Windows Service - While the Windows Service is running, the desktop app uses it instead of starting its own, and the two no longer sync settings. Mail goes to the service's own SMTP port, which defaults to 2525, not the desktop's 25. Check it under Options.
• Web Pages on Other Origins Are Blocked - Web pages on another origin can…
Related tags smtp email development testing developer-tools
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