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Full Discussion: Email to a process
Top Forums UNIX for Dummies Questions & Answers Email to a process Post 27990 by Neo on Tuesday 10th of September 2002 06:36:44 PM
Old 09-10-2002
Many people simply pipe mail received by either an MTA or MUA to a process. An MTA, such as sendmail, can receive mail and pipe it to a process. Often, mail is received by an MTA and sent to a user mailbox via a local MUA, and the MUA forwards the mail, via a pipe, to the standard-in.

Often, in a .forward file in a user directory has something like,

"|/home/user/bin/myprocess".


Or, in a file like the sendmail aliases file:

joe.user: "|/home/user/bin/myprocess"


There are many reasons to do this, a person can simply send mail to a host and in the message have embedded tokens that could be used for anything imaginable... for example, you could send a message to a user aliase and have an embedded command (with embedded security) telling your home computer to turn off the lights in your house (if you had a interface to your home lighting)....

You can literally do anything you can imagine by sending mail to a process.... your imagination is the limit.... you could send mail to our home computer and with an embedded token that could be used by a process to activate a video camera, another example.
 

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BINMAIL(1)						      General Commands Manual							BINMAIL(1)

NAME
binmail - send or receive mail among users SYNOPSIS
/bin/mail [ + ] [ -i ] [ person ] ... /bin/mail [ + ] [ -i ] -f file DESCRIPTION
Note: This is the old version 7 UNIX system mail program. The default mail command is described in Mail(1), and its binary is in the directory /usr/ucb. mail with no argument prints a user's mail, message-by-message, in last-in, first-out order; the optional argument + displays the mail mes- sages in first-in, first-out order. For each message, it reads a line from the standard input to direct disposition of the message. newline Go on to next message. d Delete message and go on to the next. p Print message again. - Go back to previous message. s [ file ] ... Save the message in the named files (`mbox' default). w [ file ] ... Save the message, without a header, in the named files (`mbox' default). m [ person ] ... Mail the message to the named persons (yourself is default). EOT (control-D) Put unexamined mail back in the mailbox and stop. q Same as EOT. !command Escape to the Shell to do command. * Print a command summary. An interrupt normally terminates the mail command; the mail file is unchanged. The optional argument -i tells mail to continue after interrupts. When persons are named, mail takes the standard input up to an end-of-file (or a line with just `.') and adds it to each person's `mail' file. The message is preceded by the sender's name and a postmark. Lines that look like postmarks are prepended with `>'. A person is usually a user name recognized by login(1). To denote a recipient on a remote system, prefix person by the system name and exclamation mark (see uucp(1C)). The -f option causes the named file, for example, `mbox', to be printed as if it were the mail file. When a user logs in he is informed of the presence of mail. FILES
/etc/passwd to identify sender and locate persons /usr/spool/mail/* incoming mail for user * mbox saved mail /tmp/ma* temp file /usr/spool/mail/*.lock lock for mail directory dead.letter unmailable text SEE ALSO
Mail(1), write(1), uucp(1C), uux(1C), xsend(1), sendmail(8) BUGS
Race conditions sometimes result in a failure to remove a lock file. Normally anybody can read your mail, unless it is sent by xsend(1). An installation can overcome this by making mail a set-user-id command that owns the mail directory. 7th Edition April 29, 1985 BINMAIL(1)
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