[Mailman-Users] Problem with Archives and Threading

[Ein Bielaczyc]

Ok, its Monday so maybe I'm missing something. I've tried to find the answer to my problem on Google and this list's searchable archives, but I failed to find one so here goes.

I'm using Mailman 2.0.13 on Redhat 7.2, with Apache 2.0.40, Python 2.2.1, and Sendmail 8.11.6. Install was successful and without incident. Overall operation is running smoothly. Message archives are viewable but are not threaded. They all show as a new message.

Now, in my searching I came across something about a "In-Reply-To:" field/line in the message header. I noticed that was non-existent in my replied, would-be threaded, messages. I am testing with a Hotmail, a Yahoo, and a Novell Groupwise account. None of which seem to create this required "In-Reply-To:" line.

Is the In-Reply-To: line requred? Is this a function of the email client, or MTA?

Ein B. :-)