mailman lists not receiving mails...

[prosys]

we recently migrated from a server to another... we had problems with some mailing lists and we decided to remove the ones with problems.
After migration, we created those mailing lists again, but now... all mails sent to [email protected] stays in qmail's local queue... i've searched the forums but i couldn't find anything related to this.. and i even tried to reinstall mailman...

we're using plesk 7.5.4 with RHEL4.