Keep getting error message from 'Cron Daemon'

Question

I have been running an Xserve G4 with Mac OS X Server 10.3.9 as a mail server and web server for several years now with no problems. Recently, however, I tried to set up a mailing list, which I had never done before. When I tried doing this, OS X automatically created a mailing list called "Mailman" for me, in addition to the mailing list I created.
Now I keep getting error messages sent by "Cron Daemon <[email protected]>" to that "Mailman" mailing list. The error messages are sent to the mailing list and I get them as a subscriber to the list. They read:
====
From: [email protected]
Subject: [Mailman] Cron <mailman@www> /usr/bin/python -S /usr/share/mailman/cron/senddigests
Date: 6 mai 2006 12:00:00 HAA
To: [email protected]
Modules/gcmodule.c:215: failed assertion `gc->gc.gc_refs == GC_REACHABLE'
Mailman mailing list
[email protected]
http://www.mydomain.com/mailman/listinfo/mailman
===
I did some research on the OS X Server support pages and discussion forums and couldn't find any references to such a problem.
With a worldwide search with Google, I only found very obscure stuff about Python, which I know nothing about.
The mailing lists appear to be working fine other than that (and the fact that Mailman uses "www.mydomain.com" instead of just "mydomain.com").
Any help would be greatly appreciated.
Pierre

Answer 1

Thanks for the clarification. I really do not need anything fancy at this point. Also, please note that I am still using Server 10.3.9, not 10.4.
Now, as for the initial problem, I am afraid it is not gone. It has just changed. Here's what I got in my mailbox this morning:
===
From: [email protected]
Subject: Un envoi sur la liste Mailman à partir de [email protected] requiert une approbation
Date: 8 mai 2006 09:25:02 HAA
To: [email protected]
En tant qu'administrateur de liste, votre autorisation est nécessaire
pour l'envoi du message suivant vers la liste:
Liste: [email protected]
De: [email protected]
Objet: Cron <mailman@www> /usr/bin/python -S /usr/share/mailman/cron/gate_news
Raison: Envoi par un non-abonné sur une liste reservée aux abonnés
Quand vous le souhaitez, rendez-vous à:
http://www.mydomain.com/mailman/admindb/mailman
pour approuver ou rejeter la demande.
From: [email protected] (Cron Daemon)
Date: 8 mai 2006 09:25:01 HAA
To: [email protected]
Subject: Cron <mailman@www> /usr/bin/python -S /usr/share/mailman/cron/gate_news
Modules/gcmodule.c:215: failed assertion `gc->gc.gc_refs == GC_REACHABLE'
From: [email protected]
===
In other words, the error message is still coming, but now it's being sent by "[email protected]" and since this is not a subscriber to the list, I get the admin notice requiring approval. (It's in French because I am using mailman's French-language option, but you should get the gist of it .)
I still do not know:
1) what causes this message and what it means
2) why it's coming from "[email protected]" rather than "[email protected]".
Like I said, I changed the "host_name" option from "www.mydomain.com" to "mydomain.com" in both mailing lists I have, but obviously there is still some part of Mailman that thinks it should be using "www.mydomain.com".
I am afraid I still don't know what to do about this.
FWIW, I ran the check_perms command you gave me this morning and it did find 10 problems and corrected them. I don't know yet if this will help with this particular problem.