[oclug] More file sharing help needed

[Pat and Lee Ann]

Two users pat and leeann need access to a common mail account.

Login as user pat

mail folder on pat is set to symbolic link Mail -> /home/common/Mail
/home/common/Mail belongs to group common and has permissions drwxrws--- 
common has pat and leeann as members

from terminal:
sylpheed

<download new messages ok>
<go into inbox in sylpheed>

<displayed in terminal window>
46: fopen: Permission denied
47: fopen: Permission denied
48: fopen: Permission denied
49: fopen: Permission denied
49: fopen: Permission denied
50: fopen: Permission denied
51: fopen: Permission denied
52: fopen: Permission denied
53: fopen: Permission denied
.........

<ls -la in Mail>
-rw------- leeann leeann <size> <date> 46
-rw------- leeann leeann <size> <date> 47
-rw------- leeann leeann <size> <date> 48
-rw------- leeann leeann <size> <date> 49
-rw------- leeann leeann <size> <date> 50
-rw------- leeann leeann <size> <date> 51
...................

Messages downloaded by one user are sucessfully stored in /home/common/Mail but
 cannot be accessed by other users of group common.

What am I doing wrong?

Thanks

Pat Gilliland