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Operating Systems Linux Red Hat Problems sending mail: Difference between Mail and Mailx? Post 302850403 by MadeInGermany on Wednesday 4th of September 2013 04:07:04 PM
Old 09-04-2013
The -r option is not portable. Maybe on purpose because it's ideal for a spammer.
The default is the user who sends the mail, and the administrator put some rules to generate a sender address out of it. (And that's not safe against a professional spammer either.)
I like the old Unix mail or sendmail tools that do not even know a -s option, and you have to construct the mail header in SMTP style:
Code:
echo "\
Subject: $SUBJECT 
From: $FROM

$MESSAGE
" | mail $RECIPIENTS

NB an empty line indicates the end of the header section.
You can still try that with your advanced mail and mailx programs...
 

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MAIL(1) 						      General Commands Manual							   MAIL(1)

NAME
mail - send and receive electronic mail SYNOPSIS
mail [-dpqrv] [-f file] [user] OPTIONS
-d Force use of the shell variable MAILER -f Use file instead of /usr/spool/mail/user as mailbox -p Print all mail and then exit -q Quit program if SIGINT received -r Reverse print order, i.e., print oldest first -v Verbose mode EXAMPLES
mail ast # Send a message to ast mail # Read your mail DESCRIPTION
Mail is an extremely simple electronic mail program. It can be used to send or receive email on a single MINIX system, in which case it functions as user agent and local delivery agent. If the flag MAILER is defined in mail.c, it can also call a transport agent to handle remote mail as well. No such agent is supplied with MINIX. When called by user with no arguments, it examines the mailbox /usr/spool/mail/user, prints one message (depending on the -r flag), and waits for one of the following commands: <newline> Go to the next message - Print the previous message !command Fork off a shell and execute command CTRL-D Update the mailbox and quit (same as q) d Delete the current message and go to the next one q Update the mailbox and quit (same as CTRL-D) p Print the current message again s [file] Save message in the named file x Exit without updating the mailbox To send mail, the program is called with the name of the recipient as an argument. The mail is sent, along with a postmark line containing the date. For local delivery, a file named after the recipient in the directory /usr/spool/mail must be writable. If the directory /usr/spool/mail does not exist then the mail is dumped on the console, so that system programs have a way to notify a user on a system that does not have a mail spool. MAIL(1)
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