The one thing that you can lose by doing this is chkuser support. Two workarounds are to use MySQL w/ valias support, or perhaps share the mail spool via NFS.
Mailing lists aren't stored in MySQL, even with valias support turned on. I have ideas on how to do it, but I can't spare the time to work on it unless someone sponsors the work.
-- Tom Collins - [EMAIL PROTECTED] QmailAdmin: http://qmailadmin.sf.net/ Vpopmail: http://vpopmail.sf.net/ Info on the Sniffter hand-held Network Tester: http://sniffter.com/