lists probleme

[iptrust]

mailman problem. HELP URGENT

Hi,

I have created a mailing list ---> OK
Send a mail to this mailing list ---> OK
Receive the mail ---> OK

The first mail was this one:
_________________________________
Welcome to the [email protected] mailing list!

To post to this list, send your email to:

[email protected]

General information about the mailing list is at:

http://lists.mydomain.com/mailman/listinfo/ca
___________________________________

But this url is not working, like all others url in this mail.
Impossible to access to mailman ... Error 404

But, for exemple webmail.mydomain.com is working fine.
All the DNS zone were created by PLESK
For lists :

lists.solana-asso.com. CNAME solana-asso.com.

Of course when i try to ping webmail.mydomain.com -> ok
When I try to ping lists.mydomain.com -> unable to find the host.


Any idea ?