Roy Rapoport writes on 26 March 1997 at 19:52:15
On March 26, 1997, "Timothy J. Luoma" <luomat(_at_)peak(_dot_)org> said:
I am helping a few people debug their sendmail configs. They are
trying to make sure all their headers are in the right order, etc.
I would like to be able to setup a thing where they could send me a
message with a certain subject and get an automated response -- but
[...]
Here's my solution...it uses an alias I call "loopback".
Dan
------------------- message is author's opinion only ------------------
J. Daniel Smith <DanS(_at_)bristol(_dot_)com>
http://www.bristol.com/~DanS
Bristol Technology B.V. +31 33 450 50 50, ...51 (FAX)
Amersfoort, The Netherlands {info,jobs}(_at_)bristol(_dot_)com
-----
#
# J. Daniel Smith
# 1 May 1996
#
# loopback.rc - bounce a message back to the sender
#
#####
##### Initial setup needed for *all* procmail invokations
#####
PATH=/bin:/usr/bin:/usr/ucb:/usr/local/bin
SHELL=/bin/sh
MAILDIR=/tmp
# log everything verbosely, since I want to see how all this works
# this needs to be near the beginning of the file to turn logging on ASAP
#LOGFILE=$MAILDIR/LOG
#VERBOSE=on
# define the local top-level domain and fully-qualified domain names
DOMAIN=bristol.com
FQDN=${DOMAIN}
#####
##### Extract/generate interesting mail headers
#####
# get the date in RFC822 format for insertion into some messages;
# the "Resent-Date:" field is copied from the "Date:" field on some systems.
# RFC1123 says "All mail software SHOULD use 4-digit years in dates..."
# sun4 doesn't recognize all "date" flags
#year=`date '+%y'`
#DATE=`cent=19; if [ $year -lt 70 ]; then cent=20; fi; date "+%a, %d %h $cent%y
%T EST"`
DATE=`date '+%a, %d %h %Y %H:%M:%S %Z'`
# prevent mail loops
:0
* ^FROM_DAEMON
/dev/null
# large messages are simply bounced back; 69 = EX_UNAVAILABLE
TRAP="exit 69;"
EXITCODE=69
:0
* > 7000
/dev/null
EXITCODE=0
TRAP=""
HOSTNAME=`hostname`
:0c:
loopback.$$
:a
|(formail -rt \
-I "Reply-To: Postmaster(_at_)$DOMAIN" \
-I 'Precedence: junk' \
-I 'MIME-Version: 1.0' \
-I 'Content-Type: multipart/mixed; boundary="-- next item ----"'; \
echo "This is the preamble of an RFC-1521 encoded, mixed message."; \
echo "---- next item ----"; \
echo "Content-Type: text/plain"; \
echo "Context-Description: bristol.txt"; \
echo ""; \
echo "Your message was received at $DOMAIN on $DATE"; \
echo "Bristol Technology is the leading supplier of cross-platform"; \
echo "development solutions, including Wind/U, HyperHelp and XPrinter."; \
echo "For details, visit our WWW site at http://www.bristol.com";; \
echo ""; \
if [ "$HOST" != "" ]; then \
echo "This machine ($HOST) is located at the Bristol offices:"; \
else \
echo "This machine ($HOSTNAME) is located at the Bristol offices:"; \
fi; \
echo "41.28N -73.45W; 241 Ethan Allen Hwy, Ridgefield, CT; +1 203 438 6969"; \
echo ""; \
echo "Questions about this message should be sent to
postmaster(_at_)$DOMAIN"; \
echo "---- next item ----"; \
echo "Content-Type: message/rfc822"; \
echo "Context-Description: bounce.txt"; \
echo ""; \
formail -I "From " < $MAILDIR/$LASTFOLDER; \
echo "---- next item ------"; \
) | ($SENDMAIL -t; rm -f $MAILDIR/$LASTFOLDER)
# don't want to save any messages away
:0
/dev/null