All cameras most likely have SMTP alarm integration (they can send an email on alert). QNAP QVR for example cannot take an email as an alert but it has a dedicated endpoints for receiving alerts. This is a Simple SMTP serwer that forwards received e-maile to typowe dedicated endpoints (indicating something happened).
This issue appears to be discussing a feature request or bug report related to the repository. Based on the content, it seems to be resolved. The issue was opened by pawel0987 and has received 0 comments.