Where are Zimbra login logs stored, and what additional functionality does the open-source code from this guide include?

Zimbra login logs are stored at `/opt/zimbra/log/mailbox.log`. The open-source code from this guide (available on GitHub) adds two new features: obtaining tokens for mailbox users and file upload via clientUploader. It also includes support for the CVE-2019-9621 SSRF vulnerability, allowing access to management resources when the admin port (7071) is closed. For related features like email forwarding, see Zimbra SOAP API Development Guide 5 - Email Forwarding.