Sam,
In re. APOP I believe that APOP will be ommited indefinitely owing to the
support for TLS.

"There is a strong desire in the IETF to eliminate the transmission of
   clear-text passwords over unencrypted channels.  While SASL can be
   used for this purpose, TLS provides an additional tool with different
   deployability characteristics."

TSL provides a standardised method of layering an application protocol on an
encrypted transport protocol, and removes some of the need for developers to
re-invent security mechanisms.

"One advantage of TLS is that it is application protocol independent.
   Higher level protocols can layer on top of the TLS Protocol
   transparently"

Most common modern POP and SMTP clients including M$ products support TLS.

d.


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