Email to a process Post: 27990

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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

09-10-2002

Administrator

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.

Neo

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LEARN ABOUT NETBSD

forward

FORWARD(5)						      BSD File Formats Manual							FORWARD(5)

NAME

     forward -- mail forwarding instructions

DESCRIPTION

     The .forward file contains a list of mail addresses or programs that the user's mail should be redirected to.  If the file is not present,
     then no mail forwarding will be done.  Mail may also be forwarded as the standard input to a program by prefixing the line with the normal
     shell pipe symbol (|).  If arguments are to be passed to the command, then the entire line should be enclosed in quotes.  For security rea-
     sons, the .forward file must be owned by the user the mail is being sent to, or by root, and the user's shell must be listed in /etc/shells.

     For example, if a .forward file contained the following lines:

	   nobody@NetBSD.org
	   "|/usr/bin/vacation nobody"

     Mail would be forwarded to <nobody@NetBSD.org> and to the program /usr/bin/vacation with the single argument nobody.

     If a local user address is prefixed with a backslash character, mail is delivered directly to the user's mail spool file, bypassing further
     redirection.

     For example, if user chris had a .forward file containing the following lines:

	   chris@otherhost
	   chris

     One copy of mail would be forwarded to chris@otherhost and another copy would be retained as mail for local user chris.

FILES

     $HOME/.forward  The user's forwarding instructions.

SEE ALSO

     aliases(5), mailaddr(7), sendmail(8)

BSD
								   July 2, 1996 							       BSD