--On Saturday, 13 July, 2002 09:51 -0400 Keith Moore
<moore(_at_)cs(_dot_)utk(_dot_)edu> wrote:
...
4. the RCAP command is acceptable at any time that MAIL or RCPT
would be acceptable. clients MAY issue RCAP before or after
MAIL, and they MAY issue RCAP and RCPT commands in any order.
(though generally it makes more sense to issue RCAP for a
recipient before sending RCPT for that recipient)
The RCAP response MUST be the same regardless of whether the
command is issued before or after MAIL, or before or after RCPT.
Keith, I don't assume this would be heavily used, but, as with
SIZE, I can imagine some sites being willing to accept more
complex formats from some senders than from others. Of course,
such mechanisms are easily thwarted in the absence of SMTP
authentication or trusted transport (and would not be available
with some of the other proposals). But, unless you have a
substantive reason for permitting RCAP before MAIL, it would seem
desirable to force it to come after MAIL, thereby preserving this
implementation option at substantially no cost.
john