You can create and send emails using any language or writing script that macOS supports. In addition, you can use any language to input mailing list data.
The Direct Mail app interface is currently English-only.
Subscribe forms that you create using Direct Mail are available in several languages. When a visitors views your subscribe form, the translation is chosen automatically based on the language setting of the visitor's computer and web browser. The following languages are currently supported:
Like subscribe forms, Direct Mail's unsubscribe, forward to a friend, and spam reporting web pages are also translated into the languages listed above.