Mailman migration from non-Plesk site

[AMA-INC IT]

I have two mailman "domains" running on a non-Plesk server. The lists have all been moved over but we are experiencing some major difficulties. One "domain" is working fine as it is [email protected]. The second domain is [email protected] and will not function properly. Since these are existing lists that have been working fine we are unable to modifiy them and we need DomainB to be able to send and receive as lists.domainB.org.