Re: Of Messages and Testing...

JdeBP> Requiring this breaks SMTP Pipelining, and is another 
JdeBP> example (as if we needed any more) of anti-UBM measures
JdeBP> fracturing existing SMTP functionality.

DW> Pipelining is an extension, so the server needn't advertise
DW> support for it. (Not that it invalidates your point below.)

It doesn't invalidate my point above, either.  (-:  Requiring the SMTP Relay 
client to wait for the response to the end-of-data indicator breaks SMTP 
Pipelining, therefore servers that do this cannot support SMTP Pipelining.  
Extension or not, SMTP Pipelining is still existing SMTP functionality that 
becomes unusable with this anti-UBM measure in place.

<URL:http://homepages.tesco.net./~J.deBoynePollard/Proposals/IM2000/differences-from-smtp.html#ImplicitPipelining>