Hello all,
We just upgraded our server to CentOS 5 but one thing still stays unresolved. Namely, that one of the virtual hosts does not receive any email, either through Mailman or otherwise. All Mailman lists can be accessed through CPanel and through their respective URLs, but when a list subscriber sends a message to the list, they get "undeliverable" response.
Any ideas on where I could look to resolve this?

Thanks in advance,
Vick