How is Transfer-Encoding implemented in Microsoft Exchange Server 2003?
A10: When routing group boundaries, Exchange and SMTP target destinations also determine how Exchange Server 2003 encodes mail. In mixed mode, Exchange Server 2003 encodes as quoted-printable or 7-bit (TNEF format) when sending between two servers/recipients in different routing groups and to the Internet. In native mode, Exchange Server 2003 encodes in Binary (Summary TNEF) when sending to a recipient/server in the same or other routing groups.