What is git-multimail?

git-multimail is a tool that automatically sends email notifications whenever someone pushes new code to a shared Git repository. Instead of team members having to manually check a project to see what changed, they get a detailed summary in their inbox. It is an improved version of an older notification script that came with Git, designed to keep everyone in the loop about updates to the codebase. When someone pushes new code, the tool generates a few different types of emails. First, it sends a summary email describing what happened overall, like whether a branch was created, deleted, or updated. Then, it sends a separate email for each individual code change (or commit), showing exactly which files were modified and including the actual code differences. These commit emails are organized as replies to the initial summary email, making it easy to scan through them in an email client and reply with feedback about specific updates. It can also send a special announcement email when a new release tag is created. This is most useful for teams of developers who want to monitor a shared, central code repository. For example, a project manager might subscribe to receive these emails so they can track daily progress and see exactly what features were added. Meanwhile, a developer reviewing a colleague's work can read the incoming commit emails, spot a potential bug in the code differences, and reply directly to that email to start a conversation about it. The tool is a Python script installed directly into the repository's "hooks", trigger points that run automatically after events like a push. It requires very little setup, relying on standard software already found on most servers. The project is highly configurable, allowing administrators to fine-tune exactly who gets which emails, whether the emails are plain text or colorized HTML, and whether they are sent through a standard local mail program or an external SMTP server. It also includes built-in support for popular Git hosting platforms like Gitolite, Bitbucket, and Gerrit.