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Path: utzoo!watmath!clyde!rutgers!ames!cit-vax!amdahl!dlb!auspyr!joe
From: joe@auspyr.UUCP
Newsgroups: comp.unix.questions
Subject: Compress Mail via sendmail.cf + rmail script
Message-ID: <297@auspyr.UUCP>
Date: Fri, 23-Jan-87 16:57:12 EST
Article-I.D.: auspyr.297
Posted: Fri Jan 23 16:57:12 1987
Date-Received: Sat, 24-Jan-87 06:52:09 EST
Organization: Austec, Inc., San Jose, CA. USA
Lines: 57
Keywords: idea willitwork


I'm sure I'm not the first to come up with this idea, but I'm planning
on implementing compressed mail between two BSD sites and would like
to know what kind of problems I can expect.


Here is the basic idea:

	1) Defined a string in sendmail.cf that contains site names that
	allow execution of "uncomprmail".

	2) When someone sends mail to one of the above sites, sendmail will
	locally run "comprmail" and ship the file to site!uncomprmail
	via uux. "comprmail" will compress the mail.

	3) recieving end ("uncomprmail") decompresses the mail and runs
	rmail locally with same args.


Sendmail.cf has the following modifications:

	# define sites that uncompress mail
	CC test1 test2 test3

	#
	# someplace in ruleset 0 ...
	# if site name is a site name in $C macro, then run "compress" mailer
	# with host and user set.
	R$=C!$+			$#compress$@$1$:$2		compressed rmail

	#
	# someplace after ruleset 5 (or does it matter?)
	# define the "compress" mailer ...
	Mcompress, P=/bin/sh, F=sDFMhuU, S=13, R=23, M=100000,
		A=/bin/sh /usr/local/uubin/comprmail $h!uncomprmail ($u)


/usr/local/uubin/comprmail contains the following:

	# compress mail and ship to uux
	# sendmail will send args:  site!uncomprmail user
	exec compress | uux $*

/usr/local/uubin/uncomprmail contains the following:

	# uncompress standard in and send to rmail
	# typically, uuxqt will run this with args: user
	exec compress -d | rmail $*

AT the moment, I don't have two BSD 4.2 systems ready to test this.
Can anyone think of any problems that might occure?

-- 
"No matter      Joe Angelo, Sr. Sys. Engineer @ Austec, Inc., San Jose, CA.
where you go,   ARPA: aussjo!joe@lll-tis-b.arpa       PHONE: [408] 279-5533
there you       UUCP: {sdencore,necntc,cbosgd,amdahl,ptsfa,dana}!aussjo!joe
are ..."        UUCP: {styx,imagen,dlb,gould,sci,altnet}!auspyr!joe