Setting Git for email send

Many communities are using Github nowadays, but some communities still use mailing list based development style. The Linux kernel community would be a good example. In the style, all major communications are made by email only. Patches are submitted to the maintainers and one more open mailing lists as a mail. Reviews are also made as replies to the mail. Because some email clients can distort the original content for so-called ``rich user experience’’ (e.