$(8$ points$)$ Assume that Bob uses an e$-$mail client $($mail reader$)$ such as Outlook to send an e$-$mail to Alice who uses a Web$-$based e$-$mail account $($such as Gmail$).$ The IP address of Alice's mail server is initially unknown to Bob's mail server. List all the transport and application layer protocols that are involved from the time when Bob sends the e$-$mail to the time when Alice reads it$.$ Clearly indicate in which part of the transfer of the e$-$mail these transport$/$application layer protocols are used.