Would appreciate help on these questions with wireshark. Pls include screenshots for easier explanation

Start Wireshark and either capture your SMTP packets or open the file called POP3 Capture.pkt. (Note: Depending on the version of Wireshark you are using, the file extension may be pkt or pcap.) We used the email software on our client computer to read an email message that was our email server. Figure 2-21 shows the packets we captured that were sent to and from the client computer (called 128.196.239.91) and the server (128.192.40.4) to send an email message from the server to the client. The first few packets are called the handshake, as the client logs in to the server and the server accepts the login. Packet 12 is the POP STAT command (status) that asks the server to show the number of email messages in the user's mailbox. The server responds in packet 13 and tells the client there is one message. Packet 16 is the POP LIST command that asks the server to send the client a summary of email messages, which it does in packet 17 . Packet 18 is the POP RETR command (retrieve) that asks the server to send message 1 to the client. Packets 20, 22, and 23 contain the email message. It's not that easy to read, but by looking in the bottom window for packet 20, you can see what the sender wrote. You can also expand the POP packet in the middle packet detail window (by clicking on the + box in front of it), which is easier to read