The Email Transport provider enables you to receive data (in the form of a message) from a POP3 Email server, and send data (as a message) as Email.
The Receive Transport allows you to configure the POP3 settings (the Windows account will be that of the relevant server), and the format of the message. It also allows you to configure the names of Message Context Properties to receive the incoming Email Subject, Body and Sender if required.
The Send Transport similarly allows you to configure the message format, though no SMTP settings are required as the Emails are sent via Servers configured for Email. No Emails will be leave the system unless at least one Server configured to send Email is running – it will instead be queued until such a Server is running.