mail archive file

Currently my Smartlist saves mail archive with permission 660 and group of the list account, like in: -rw-rw---- 1 slist slist 1860 Jun 6 09:38 4298 How may I change it to save with permission 644 or with a different group? (I have already made ~slist a member of another group), like in -rw-r--r-- 1 slist slist 1860 Jun 6 09:38 4298 -rw-rw---- 1 slist web 1860 Jun 6 09:38 4298 I guess it would be somewhere in rc.submit but appreciate any hint. Thanks, Zhiliang