https://goshs.de/en/usage/collaboration/smtp/index.html How to use goshs as an SMTP server goshs includes a lightweight SMTP server that receives and logs incoming emails including attachments. This is useful in penetration testing and CTF scenarios where you want to capture emails triggered by password resets, alert mechanisms, or other server-side email functionality. Tip To receive emails from the internet you need a registered domain with an A record pointing to your server. See Domain setup for the full configuration. Hugo en-US