Linux and Unix mail and rmail command
One of the ways that allows you to read/send E-Mail.
mail [-t] [-w] [ -m message_Type ] recipient ...
rmail [-t] [-w] [ -m message_Type ] recipient ...
mail [-e] [-h] [-p] [-P] [-q] [-r] [ -f file ]
mail [ -x debug_level ] [ other_mail_options ] recipient ...
|-t||A To: line is added to the message header for each of the intended recipients.|
|-w||A letter is sent to a remote recipient without waiting for the completion of the remote transfer program.|
|-m message_Type||A Message-Type: line is added to the message header with the value of message_Type.|
|-e||Mail is not printed. An exit status of 0 is returned if the user has mail; otherwise, an exit status of 1 is returned.|
|-h||A window of headers are initially displayed rather than the latest message. The display is followed by the ? prompt.|
|-p||All messages are printed without prompting for disposition.|
|-P||All messages are printed with all header lines displayed, rather than the default selective header line display.|
|-q||mail terminates after interrupts. Normally an interrupt causes only the termination of the message being printed.|
|-r||Messages are printed in first-in, first-out order.|
|-f file||mail uses file (such as mbox) instead of the default mailfile.|
|-x debug_level||mail creates a trace file containing debugging information.|
|#||Display message number|
|+||Next (no delete)|
|!command||Escape to the shell to execut command.|
|<CR>||Next (no delete)|
|a||Print message that arrived during the mail session.|
|d or dp||Delete the current message and print the next message.|
|d n||Delete message number n. Do not go on to next message.|
|dq||Delete message and quit mail.|
|h||Display a window of headers around current message.|
|h n||Display a window of headers around message number n.|
|h a||Display headers of all messages in the user's mailfile.|
|h d||Display headers of messages scheduled for deletion.|
|m [persons]||Mail (and delete) the current message to the named persons.|
|n||Print message number n.|
|p||Print current message again, overriding any indications of binary (that is, unprintable) content.|
|P||Override default brief mode and print current message again, displaying all header lines.|
|q, or CTRL-D||Put undeleted mail back in the mailfile and quit mail .|
|r [users]||Reply to the sender, and other users, then delete the message.|
|s [files]||Save message in the named file s (mbox is default) and delete the message.|
|u [n]||Undelete message number n (default is last read).|
|w [files]||Save message contents, without any header lines, in the named files (mbox is default) and delete the message.|
|x||Put all mail back in the mailfile unchanged and exit mail .|
|y [files]||Same as -w option.|
|?||Print a command summary.|
Opens the mail program with the first message in the mail (if applicable).
Starts a new e-mail, sending the e-mail to the support at Computer Hope. When composing a message to terminate the message type a period ( . ) and press enter.