What is Rich Text in Mail.app?

When I compose a message in Mail.app, I have the option of sending it in "Plain Text" or "Rich Text".
When I receive a Formatted Text message in Mail.app, it is generally --but not always-- handled correctly. The formatting applied by the sender, in whatever email client, seems to appear consistently in Mail.app.   Not always perfectly.
Probably I can find a standard for RTF as applies to many Text Processor apps...
• Is that the same "Rich Text" as followed by Mail.app?
• Is there a public RTF standard that Mail.app is known to follow?
• Is there a direct method, or a reasonably simple indirect method for making Mail.app's RTF formatting visible?
• Beside Mail.app's GUI commands, is there a direct method, or a reasonably simple indirect method for editing Mail.app's RTF formatting?
I think most email clients transmit Formatted Text messages using HTML tags.
• Does mail.app handle these in addition to RTF, convert HTML tags to RTF, or is, in this context, RTF ~= HTML?
• Is there a public standard HTML standard --certainly a subset-- that Mail.app is known to follow?
I think all Formatted Text messages are actually transmitted by email servers with two copies, one formatted and one plain-text. I know I can often see HTML markup when I use View-->Message-->Raw Source on an incoming message selected. But there doesn't seem to be any way of viewing or editing the markup in the reply message.   Specifically View-->Message-->Raw Source is grey when a reply is selected.
• Is there a direct method, or a reasonably simple indirect method for editing HTML tags when responding to a formatted message?
A big annoyance: Often, when I reply to a formatted message, some groups of text, when selected, are surrounded by a rounded-corner grey rectangle, with a circle-X close/delete button at the upper left. These are also visible when I'm composing a reply. It's difficult -- sometimes impossible-- to open a new line for a reply inside such boxes. I think this box corresponds to HTML table cells --or possibly other containers-- in the incoming message.
• Does Mail.app use the rounded-corner grey rectangle to mark a received table cell? Anything else?
• Is there a direct method, or reasonably simple indirect method for removing the cell container so vertical space can be inserted?
• Does Mail.app use any other special markings to denote HTML formatting?
In other words,
• What is "Rich Text" in Mail.app?
TIA

Hen3ry wrote:
Probably I can find a standard for RTF as applies to many Text Processor apps...
• Is that the same "Rich Text" as followed by Mail.app?
No, Mail.app is using HTML - as you mentioned that's pretty much true for all email applications that send or receive formatted messages. When you copy and paste from another app, it's converted to HTML (I think that conversion is handled by the system, as part of the copy/paste operation - i.e., it's converted while still on the clipboard).
• Is there a public RTF standard that Mail.app is known to follow?
HTML, not RTF. w3.org is the standards body. Like many OS X apps, Mail.app is using Webkit (the Safari web rendering engine) to display the messages (although I do notice some differences from Safari, so it's probably limited somehow, most likely for security reasons)
• Is there a direct method, or a reasonably simple indirect method for making Mail.app's RTF formatting visible?
Save your outgoing message, then view it in your "Drafts" folder. Click the "View" menu, then "Message --> Raw Source".
• Beside Mail.app's GUI commands, is there a direct method, or a reasonably simple indirect method for editing Mail.app's RTF formatting?
Nope. The "raw source" view cannot be edited.
A big annoyance: Often, when I reply to a formatted message, some groups of text, when selected, are surrounded by a rounded-corner grey rectangle, with a circle-X close/delete button at the upper left. These are also visible when I'm composing a reply. It's difficult -- sometimes impossible-- to open a new line for a reply inside such boxes. I think this box corresponds to HTML table cells --or possibly other containers-- in the incoming message.
That's essentially correct, the box corresponds to the HTML table. I think you get that when you add some HTML code to your message that Mail doesn't have the interface to edit (no table tools to add or delete rows, for instance), but I've only encountered it with tables.
• Is there a direct method, or reasonably simple indirect method for removing the cell container so vertical space can be inserted?
I usually resort to pasting the message into a more capable editor - often TextEdit is good enough, but I've sometimes resorted to using Dreamweaver. Make your changes, then paste the result (from the WYSIWYG, not the HTML code) back into your mail message.
Other times I just avoid using Mail.app. Thunderbird is better for complicated HTML, or was better - it's been a while since I've needed to use for this purpose.
• Does Mail.app use any other special markings to denote HTML formatting?
No, not to my knowledge.

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