Mailman problems

Hi,

are there any people having experience with Mailman?

I have the problem that I have a dynamic domain, which people use from
outside to come into my websever in my home via DSL flatrate to register
with Mailman. In my LAN I have a different domain name.

blabla-domain.dyndns.org for extern
domain.blubber.de for intern

I thought to do this with following construction in mm_cfg.py:

===8<---
DEFAULT_URL_HOST = 'blabla-domain.dyndns.org'
DEFAULT_EMAIL_HOST = 'blubber.de'

add_virtualhost(DEFAULT_URL_HOST, DEFAULT_EMAIL_HOST)

VIRTUAL_HOSTS = 'server.domain.blubber.de'

add_virtualhost(VIRTUAL_HOSTS, DEFAULT_EMAIL_HOST)
===8<---

but the last add_virtualhost does Mailman not accept. What do I make
wrong? What have I overseen?

CIAO Peter