[Mailman-Users] Multiple Domain Names

[Mariano Wahlmann]

I'm trying to find out how to configure mailman for multiple domain,
my site has two domain names (@agro.uba.ar and @ifeva.edu.ar). 
People use sometimes one domain, and sometimes the other, i want
to know if is posible to set mailman for accept mails for both domains
without subscribing users twice (with each domain), because if i subscribe
with two domains, users get duplicate mails.

Thanks.