from(1)
Name
from − identifies sender of mail
Syntax
from [−f mailbox] [−s sender]
Description
The from command prints out the mail header lines in a mailbox file to show you who has sent mail to you.
Options
−f mailboxUses specified file instead of your normal mail file. If this option is used, but file argument is not specified, read your mbox file.
−s senderPrints mail headers for mail sent by specified sender.
Files
/usr/spool/mail/*