On Jun 13, 2014, at 9:41 AM, Tony Finch <dot(_at_)dotat(_dot_)at> wrote:
BUT! These systems do not use the MIME external body mechanism, because it
is common for mail servers to reject these messages on the grounds that
they are too difficult to properly scan for viruses.
The end result is something pretty simiilar to MIME external bodies, but
a complete mess from the protocol architecture point of view.
Ouch. Yet another reason why a flag day may be necessary to improve the
situation.