Biztalk sending email smtp using a orchestration

I tried to follow the tutorial to send an SMTPemail form an orchestration, I attaches the link:

Sending SMTP email from within BizTalk Orchestration (eggheadcafe.com)

and few thing was not clear:

1. must y开发者_如何学运维ou add a host and hot instance to send an SMTPemail?
2. I follow the link and I added multi-part message (the message going to be send to the mail) and the construct message did not recognize it?

For #1 I can assure you that you do not need to create a new host and host instance to get the tutorial running.

You may however want to create multiple hosts and host instances if you plan to create multiple smtp send adapters with different smtp host configurations (in a real life / production environment).