You can apply patches from email-formatted patch using any raw data viewer.
For example, GMail, in the current interface, has support for it.
You can apply a patch as a commit from a mail message following these steps:
- Open the GMail web page in the message with patch data
- Click at the ellipsis icon located at top-right of this message
- Click at "Show Original". A new tab will open with the content of the message.
- Click at "Copy to clipboard"
- Open a terminal and change current directory to git-based root project directory
- Certify that the working copy is clean
- Run
git am
- Paste the code
- Type
Ctrl-D
to finish the insertion
For more information, check:
Kernel Newbies - Applying a patch tutorial
Eletric Toolbox - Gmail view raw message article