Dragging an email from an email client such as Apple's Mail.app, MS Entourage or MS Outlook will result in a new note. The email's subject becomes the note's $Name and the body copy becomes the note's $Text. Be aware that message headers, including to/from addresses, etc., are not imported.
Additionally, but only when dragging from the Mail.app:
- The new note's $URL attribute is set to the source email's Mail.app pseudo-URL (as '
message:< … >'). Note that the URL's characters on the<and>are actually stored in url-encoded form as%3Cand%3Erespectively; thus for example 'message:%3CE7B7A670-A8E3-4EEB-8921-3596825A334C@me.com%3E'. Using the URL button in the Displayed Attributes table will open the source email in Mail.app. - The imported $Text is also parsed for any Ziplinks method-style mark-up which is then evaluated and new internal text links are created if valid.
On first use of drag from Mail.app, newer OS versions will require the user to allow inter-app access (a once-only task). This presumably to enable verification of the email's source pseudo-URL.