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Re: MLM subaddress requirement

Valdis.Kletnieks@vt.edu Tue, 05 August 1997 17:01 UTC

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To: ietf-822@imc.org
Subject: Re: MLM subaddress requirement
In-Reply-To: Your message of "Tue, 05 Aug 1997 09:30:22 PDT." <Pine.SOL.3.95.970805090424.18309B-100000@eleanor.innosoft.com>
From: Valdis.Kletnieks@vt.edu
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On Tue, 05 Aug 1997 09:30:22 PDT, Chris Newman said:
> A subaddress aware MLM MUST provide a way for a user to use his
> primary address with a subaddress for subscription and use just his
> primary address for posting.  Some ways to meet this requirement include:
> 
> (1) Having no restrictions on who can post to the list.

Not Acceptable.

> (2) Permitting subscribers to register different posting and submission
> addresses.

Pain in the ass.

> (3) Ignoring subaddresses for the purpose of permitting postings.

This doesn't work.  Remember - the MLM *CAN NOT TELL* whether a piece
of mail from 'a+b@somedom.com' is from a subaddress-aware site or if
it's just from a site that has some OTHER meaning for '+'.  As such,
if you "ignore", and the list is closed, you just allowed 'a+c@somedom.com'
to improperly post/subscribe/etc to the list.

> This now directly dictates the interoperability issue rather than a
> particular solution to it (which is what I should have done in the first
> draft).  There are plenty of ways to address this requirement without any
> significant impact on MLM systems or security validation.

No there aren't.  See above.

> > Bottom line - I think this proposal is a non-starter unless it provides
> > a way for a *remote* system (such as a MLM or what-have-you) to
> > determine if the option is available or not.
> 
> Do you still feel this is necessary if I make the above change?

Yes.  If the remote system is unable to tell if an optional feature is in
use, it *MUST* assume that the feature is *NOT* present.  Blindly saying
"This is SO $%(*^$% neat that I'll assume the world does it TOO" is just
a good way to screw the users to the wall.

-- 
				Valdis Kletnieks
				Computer Systems Senior Engineer
				Virginia Tech

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