About

In the email land, transport means that:

• a SMTP client or SMTP server
• transmits
• an email message
• to a SMTP server.

This transport is defined in the SMTP protocol (ie Simple Mail Transport Protocol).

To know more:

• about email in general, see this page: How does the email system work? SMTP, POP, IMAP explained
• about the transmission, see the SMTP page