Outis

What is Outis?

Outis is a command line tool that fights spam by generating and sending a fake user unknown bounce email for messages you receive. When a spammer receives this notification, they believe your email address no longer exists and should remove it from their mailing list. This approach is particularly effective against automated AI-generated emails that expect replies.

The tool creates an RFC 3464 delivery status notification modeled after Postfix. It sends a multipart report with a 5.1.1 status code, including the original message or its headers if it exceeds fifty kilobytes. The bounce originates from MAILER-DAEMON at a domain you control, using a null envelope sender when supported by the SMTP server.

Outis supports batch processing for directories of email files and includes a monitor mode that watches your clipboard. When you copy a raw email source, it prompts you to confirm and send the bounce. Accounts are stored securely in the operating system keychain, and consumer email providers like Gmail may rewrite headers, so a custom domain with appropriate SMTP access is recommended.

Outis features

• Generates fake user unknown bounce emails
• Complies with RFC 3464 delivery status standards
• Processes multiple email files in batch mode
• Monitors clipboard for quick bounce generation
• Stores SMTP credentials in the OS keychain
• Strips large attachments to stay within limits
• Supports dry run previews before sending

Who uses Outis and for what

• Remove addresses from AI-generated spam mailing lists
• Clean up persistent phishing email senders
• Automate bulk bounce generation for archived spam folders
• Protect custom domains from repeated automated attacks
• Test how email servers handle simulated delivery failures

Outis FAQ

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