No. You'd send 'patches' via email. Each patch roughly corresponds to a commit. These are diffs + commit metadata that are directly formatted as email messages. A single submission of multiple commits will be made of multiple threaded email messages. The maintainer then 'applies' the received patches to their repo to recreate the commits from the contributor. I know that this sounds complicated, but it's quite streamlined in git. You don't have to do all that manually.

There is one more way to contribute by email. And they are... surprise! Pull requests! You can send pull requests to the maintainer via email, as long as your own modified clone repo is hosted and accessible online somewhere. It doesn't have to be on the same server (unlike github forks). This is done using the `git request-pull` command.