CmdID / Commands
Print mail header lines from the current user's mailbox. tldr-pages
On several platforms
Opens CmdID with your command. It is read in your browser and sent nowhere.
List mail
from
Display the number of messages stored
from --count
List mail in the specified mailbox directory
MAIL=path/to/mailbox from
Print the mail from the specified address
from --sender=me@example.com