OFFTOPIC Re: [Mailman-Users] Archive URL in postings (2.1b3)
J C Lawrence
claw at kanga.nu
Thu Oct 31 09:39:50 CET 2002
On Wed, 30 Oct 2002 08:05:32 -0800 (PST)
alex wetmore <alex at phred.org> wrote:
> On Tue, 29 Oct 2002, J C Lawrence wrote:
>> On Tue, 29 Oct 2002 10:56:39 -0800 (PST) alex wetmore
>> <alex at phred.org> wrote:
>>> 1) You are using an email system which removes duplicates (based on
>>> the Message-Id header). Microsoft Exchange 2000 is one such system.
>>> If Mailman is changing the headers so much perhaps it should stick a
>>> new Message-Id on the message though.
>> We should start out admitting that such mail systems are broken and
>> then decide how far we want to cater to such broken systems.
> Eliminating duplicates is a useful feature, not a broken one.
My original statement was more generous than I intended. Corrected:
MTAs which do duplicate suppression are broken. That's the function
of the MUA, or, in very constrained instances, the LDA.
> Think about the hacks that Mailman-2.1 has to prevent sending the
Yup. I'm not fond of their existence.
> In a complex corporate topology there are reasons why duplicates are
> sometimes generated, but clients should have no reason to see them.
Then they configure their MUAs not to.
> Exchange is not the only system that does this, but it might be the
> widest deployed.
FWLIW Cyrus can do dupe suppression at the LDA level. Sadly its a
>> There are multiple ways to achieve this. Parsing To: is one of the
>> more fragile ways. Far more effective and near-guaranteed to be
>> correct (except for the standard broken software case as above) is
>> tracking In-Reply-To: from your original post(s).
> That depends on keeping a database of sent message-ids and comparing
> In-Reply-To against each of them. Few clients support this.
Ignoring the closed source or otherwise opaque cases (ie no LDA/MDA
control): tracking In-Reply-To: headers is neither complex or expensive.
I do it here and have done for years.
Counting the opaque and transparent cases: Partially true. Most MUAs
will happily thread under your original message.
Note to self: Must investigate doing this sort of thing under Sieve.
I'm fairly sure it's not possible (need to escape the Sieve sandbox
for localFS access).
> If you can recommend a decent text-based IMAP client that runs on Unix
> and Win32 and which supports this functionality I'm all ears.
Sorry, I don't track the Windows state of affairs. Its been 12 years
since I used windows anything more than trivially and I've no interest
in changing that.
J C Lawrence
---------(*) Satan, oscillate my metallic sonatas.
claw at kanga.nu He lived as a devil, eh?
http://www.kanga.nu/~claw/ Evil is a name of a foeman, as I live.
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