Mail User Guide
You can choose to send email messages in plain text or rich text (HTML) format.
Text files are multi-platform: I can bounce them among my Mac, iPad, iPhone, and Windows PC without breaking a sweat. I can also drop text into any number of programs for further processing. This is probably the simplest and fastest method to paste as plain text (a.k.a. Strip text of its formatting). Copy a piece of text. When you’re in Notes, click Edit in the top menu bar. Text Edit On Mac. Text Edit is the built in text editor on the Mac. It is a very capable word processing application and for most people it will be the only word processor that you will need. With Text Edit you can open documents in Rich Text Format(RTF), Plain Text formatted documents and even the ever popular Microsoft Word format.
In the Mail app on your Mac, do one of the following in your message:
Choose Format > Make Plain Text (available only when the current format is rich text). Plain text format doesn’t include formatting (such as bold or italic text) or items like tables and images, but is readable for all recipients.
Choose Format > Make Rich Text (available only when the current format is plain text). Rich text (HTML) format can include formatting, tables and images, but may be unreadable for some recipients.
Plain Text File Mac
To use the same format for all of your messages, choose Mail > Preferences, click Composing, then choose a message format. If you want to use a different format for replies, select “Use the same message format as the original message”.