| Option | Description |
| Plain Text only | Select this option when you want recipients with Internet-style addresses to receive plain text. This is the safest option to select when you are unsure if your recipient's mail program can read HTML-formatted messages or Rich Text Format messages. |
| HTML only | Select this option when you want recipients with Internet-style addresses to receive HTML-formatted text and graphics. Note that IBM Lotus Notes Rich Text would need to be converted to MIME when sent over SMTP and this conversion causes a loss of fidelity if your default mail form is set to Rich Text Format. Recipients will receive HTML e-mail if they can read it. If their e-mail program does not support MIME, then they will receive a plain text message. |
| HTML and Plain Text | Select this option when some recipients of your mail have e-mail programs that support MIME; they will receive HTML-formatted mail. If some recipients have e-mail programs that don't support MIME, they will receive plain text. This option is the most versatile. |
| Prompt when sending | Select this option when you want Notes to prompt you to specify a format each time you send an Internet mail message. |