Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!sun-barr!olivea!samsung!sdd.hp.com!cs.utexas.edu!cse!texas!ylee
From: ylee@csl.dl.nec.com (Ying-Da Lee)
Newsgroups: comp.mail.sendmail
Subject: Re: SunOS4.1.1 sendmail.mx's actual ruleset sequence
Message-ID: <1991May9.221508.13637@csl.dl.nec.com>
Date: 9 May 91 22:15:08 GMT
References: <1991May8.231130.25587@csl.dl.nec.com> <1991May9.005329.17471@mp.cs.niu.edu>
Organization: NEC America, C & C Software Development Lab
Lines: 54

In article <1991May9.005329.17471@mp.cs.niu.edu> rickert@mp.cs.niu.edu (Neil Rickert) writes:
>  I posted a fairly complete rundown on the sequence of rules used approx.
>one week ago (message-id <1991Apr29.144019.22206@mp.cs.niu.edu>).  Your
>example amply confirms my description.  I did perhaps touch too lightly on
>the reprocessing of the recipient address which I believe happens only for
>SMTP mailers, and in my opinion is logically wrong.  (The IDA versions which
>I use do not reprocess the recipient address this way).

That was a fine article, Neil, but I am afraid the part discussing
address reprocessing must have skated right by me.  Would you mind
writing another article concentrating on that issue?

>  Now why don't you create an alias for that final recipient address so it
>won't bounce, and run your test again to see if you can confirm my
>description of the header rewriting sequence (the 'To:' and 'From:' headers).

Well, I created an account for the peculiar address (I had to,
aliasing would have caused the result of alias substitution
rather than the envelop recipient being shown on the log), and
this is what the message looks like at the receiving end:

	From 4.12.1.3.4.1.3.ylee Thu May  9 15:50:42 1991
	Received: by texas.csl.dl.nec.com (4.1/YDL1.6-910507.10)
		id AA12684(texas.csl.dl.nec.com); Thu, 9 May 91 15:50:41 CDT
	Received: by florida.csl.dl.nec.com (4.1/YDL2.0-TEST)
		id AA01372(florida.csl.dl.nec.com); Thu, 9 May 91 15:50:39 CDT
	Date: Thu, 9 May 91 15:50:39 CDT
	From: 4.12.1.3.4.12.1.3.4.1.3.ylee
	Message-Id: <9105092050.AA01372@florida.csl.dl.nec.com>
	To: 4.22.2.3.ylee@csl.dl.nec.com
	Subject: testing
	Cc: 4.22.2.3.ylee@csl.dl.nec.com
	
	to ylee@texas.csl.dl.nec.com
	cc to ylee@csl.dl.nec.com

The corresponding log entries are:

May  9 15:50:41 texas sendmail[12684]: AA12684: message-id=<9105092050.AA01372@florida.csl.dl.nec.com>
May  9 15:50:41 texas sendmail[12684]: AA12684: from=<4.12.1.3.4.1.3.ylee>, size=373, class=0
May  9 15:50:42 texas sendmail[12687]: AA12684: to=<4.22.2.3.4.22.2.0.3.ylee@csl.dl.nec.com>, delay=00:00:01, stat=Sent

The To: and Cc: fields run through 3,2,22,4 as expected, but everything
else seems very peculiar.  Why is it that From, envelop sender, and
envelop recipient go through the loop twice and the From: field does
three times?  This is all very puzzling.

	Ying-Da Lee			(214)518-3490
	C&C Software Development Lab
	NEC America			(214)518-3990 (FAX)
	ylee@csl.dl.nec.com
	uunet!necbsd!ylee