You can disable the Internet Mail Service text quoting in outgoing messages that are not sent with rich text formatting by setting the UseRTFText registry value to 0. By default, text quoting behavior is enabled and applies Internet-style quoting to reply-and-forward text by inserting a greater than (>) character before each line.
Quoting is also applied to text that is cut and pasted from a message into a compose note. When sending a message with a command to a list server, it is important to make sure the text is not quoted; otherwise, the list server cannot interpret the command. You can type the command manually. Alternatively, you can use the Paste Special command to paste the plain text. Do not paste the formatted text.
Note UseRTFText also affects word-wrap. If enabled, text lines in all non-TNEF messages are wrapped at a fixed column. The word-wrap setting for non-MIME messages on the Internet Mail Service properties in the Microsoft Exchange Server Administrator program is ignored.
You can disable quoting using the Windows NT registry.