Hex Pane is the bottom pane where whole information in the packet is shown in hexadecimal format on the left and also in character when possible and decimal also.It is the bottom pane of Wireshark window.
So we can say that Hex pane is referred to the bottom pane of the Wireshark window which displays the information in hexadecimal on the left .
The main features of email is, (1) Attachment :Ability to attach the files along the messages is one of most useful features of email. (2)Address book: It is also most important features of email that allows a user to storing the information.