Mail server config inconsistent when host name differs from domain name

Question

Hi,
I've installed Leopard server on host server.example.com but want to server email for example.com the host name for incoming mail should be mx01.example.com. DNS is setup properly resolving server.example.com and mx01.example.com (both forward and reverse, mx01 having a separate IP) and mx01.example.com is set as MX for example.com. Both IPs are routed to the internal server by the firewall.
In Server Admin, server.example.com is set as computer name (also resolved to the proper internal IP by our internal DNS), and in mail settings -> General, domain name is set to example.com and host name to mx01.example.com (so that the mail server identifies itself properly when connected on port 25).
Normal mail traffic works perfectly: Users can send and receive mail from/to addresses like <user_shortname>@example.com. I've got problems with mailing lists, though:
First, group based mailing lists (for groups created in Workgroup Manager) have the wrong addresses: <group_shortname>@server.example.com. Those addresses are linked when you view the croup in Directory.app. You can send mails to eg [email protected] when connecting to the server via telnet on port 25, but get an error email ([email protected]>: mail for server.example.com loops back to myself, Reporting-MTA: mx01.example.com) back.
Second, mailman based mailing lists also have the wrong addresses: <listname>@server.example.com and at the bottom of the mails received from the lists, there are also links to the lists web page with the url mx01.example.com instead of the host's name server.example.com.
mx01 should only be used by incoming SMTP, but if this isn't possible, I could revert to using server.example.com for the MX record as well. But the email addresses should definitely use the domain name and not the full server name as domain part. This is a typical email server setup and I can't understand why leopard server handles this differently. Does anyone have a workaround for this or could tell me how to setup an email system properly?
Thanks a lot in advance!!
Cheers, Thomas

Answer 1

Well, you pointed me into the right direction: Changing the mail server's host name helped a bit. I just dumped the name mx01.example.org. The host is called server.example.org and in mail settings, the domain name is set to example.org while the host name is set to server.example.com. The MX record will have to point to server.example.org, then.
The server now accepts emails to group based mailing lists à la <group_shortname>@example.org. In Directory.app, the link the the group's mailing list still opens a new Mail to <group_shortname>@server.example.org, though.
For mailman based mailing lists, the link to the list's listinfo page in the bottom of emails received from the list is now correctly pointing to server.example.org. The list's address shown there still is <list_name>@server.example.org.