This is from the help. You might also want to edit your location document to send MIME across the Internet. (The help database can instruct you in that one too.)
One trick with your help database is to full text index it, and alway search it, rather than trying to find the subject by browsing.
Kevin
To send your Internet mail or news in plain text or HTML or both
1. Choose File - Preferences - User Preferences.
2. Click the Mail And News Icon.
3. Under "Internet message format" (or Internet news format), choose an option.
Plain text Choose plain text when you want recipients with internet style addresses to receive plain text. This is the safest option to make when you are unsure if your recipient's mail program can read HTML formatted messages or Rich Text Format messages.
HTML format When you want recipients with internet style addresses to receive HTML formatted text and graphics. Note that 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 email if they can read it. If their e-mail program does not support MIME, then they will not be able to read your message.
HTML and Plain text 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.
The format you choose also depends on whether your recipients have Notes addresses or Internet mail addresses. See Using MIME or Rich Text Format in the mail form.
Choose "Prompt when sending" to have Notes prompt you to specify a format each time you send an Internet mail message.
Note If you send an HTML formatted message (MIME) and if recipients e-mail programs can support MIME, then message is delivered as such. Otherwise, recipient receives a plain text message.