SMTP support in ebMS 3.0?

Hi ebMS Team

One question I have for the TC:

"Is SMTP supported as a first class transport protocol in ebMS 3.0"?

If not than I can see a problem for two SME's which do not have an
always on HTTP server.

With ebMS 2.0 an SME can always use SMTP to make sure he can go online,
send the ebXML message to the receivers SMTP server and go offline
again. And the receiver can go online, check with its SMTP server for
new ebXML messages, process them and go offline again. Often the SME's
have regular email (maybe from their Internet Service Providers or
someone hosting their website and doing their email) and hence would
also have an "ebXML message" email address. 

Regards

Sacha