Problem installing mailman along zimbra

[Day]

Hi,

I have currently a zimbra server (zcs-5.0.6_GA_2313.DEBIAN4.0.20080522112011), and i need to install mailman on it.
I have followed this howto : [SOLVED] Zimbra+Mailman Howto

But i'm stuck now

I'm able to access the web interfaces and to administer the mailing-lists.
I have created a mailing-list named 'test', but when i try to write to it, test@mydomain.com, it answers that the user test@mydomain.com doesn't exist.

I have read each and every post containing the word "mailman" in the forum before posting, but now i need some advice.
Being a novice about zimbra, it might be an obvious advice

I think I have reached the point where /opt/zimbra/postfix/conf/main.cf doesn't keep its configuration.

This is what I do :
# su - zimbra
$ /opt/zimbra/bin/zmlocalconfig -e virtual_alias_maps=ldap:/opt/zimbra/conf/ldap-vam.cf,hash:/opt/mailman/data/virtual-mailman
$ /opt/zimbra/bin/zmlocalconfig -e alias_maps=hash:/etc/aliases,hash:/opt/mailman/data/aliases
$ zmprov mcf zimbraMtaMyDestination mydomain.com
$ postfix reload

And lo : /opt/zimbra/postfix/conf/main.cf doesn't keep its configuration !
Is there something I do not do correctly, or should I look for the problem elsewhere ?

(Friday curse : i leave in 1 hour and am back monday morning)

[Day]

Hi, i'm back :-)

Nobody has a hint ?

[uxbod]

ZCS Mailman Integration - Zimbra :: Wiki

[Day]

Thanks uxbod, i think i have read it too, but i'm going check everything according to this tutorial, too.

[Day]

Well, this is a tutorial to install zimbra and mailman on two different machines. I need to install them on the same one.

This tutorial uses two postfix install. Isn't it possible to do it with only the one of zimbra ? That's why I chose the [SOLVED] Zimbra+Mailman Howto tutorial.

Any idea about what i do not do correctly according to this howto ?