||As in basic email the sending computer connects to a Transmit (Tx) server. In some cases the link is secured (https) to give the illusion that your email is private. However this might prevent the viewing of your email during its travel between the sending computer and the Transmit server, it does arrive unencrypted and readable to the Transmit server.
||The journey between the Transmit and Receive servers is the same as basic email.
||As with the sender, the recipient may be using a secure connection (https) but the prying eyes already have the unencrypted email.