Changing the number of displayed lines at the top of a message

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The top subcommand enables you to scan through a message without reading the entire message.

You control how many lines of a message are displayed by setting the toplines option as follows: 
set toplines=Lines

In this subcommand, the Lines variable is the number of lines, starting from the top and including all header fields, that are displayed with the top subcommand.

For example, if user Amy has the following line in her .mailrc file: 
set toplines=10
when Amy runs the mail command to read her new messages, the following text is displayed: 
Mail Type ? for help.
"/usr/mail/amy": 2 messages 2 new>
N 1 george  Wed Jan 6 9:47  11/257 "Dept Meeting"
N 2 mark    Wed Jan 6 12:59 17/445 "Project Planner"
When Amy uses the top subcommand to browse through her messages, the following partial message is displayed: 
top 1
Message 1:
From george Wed Jan 6 9:47 CST 1988
Received: by zeus
    id AA00549; Wed, 6 Jan 88 9:47:46 CST
Date: Wed, 6 Jan 88 9:47:46 CST
From: george@zeus
Message-Id: <8709111757.AA00178>
To: amy@zeus
Subject: Dept Meeting
Please plan to attend the department meeting on Friday
at 1:30 in the planning conference room. We will be

The message is partially displayed because toplines is set to 10. Only lines 1 (the Received: field) through 10 (the second line of the message body) are displayed. The first line, From george Wed Jan 6 9:47 CST 1988, is always present and does not count in the toplines option.