less /var/mail/mymailboxThis will be fast. Press "G" to go to the send and "u" to go up a page. You can do "u" multiple times.
Computer Tips - How can I view some of a large file?
Date: 2012dec3 OS: Linux Q. How can I view some of a large file? A. If you have a text file that is megabytes in size you can efficiently view it on the command line with "less". For example mailbox in /var/mail often get really big. Open a file with: