[Djigzo users] Which MTA logfile ?

Hi, I have installed djigzo on a OpenSuSE 11.1 system. Encryption and signing seems to work without a problem, but there's one nasty detail, which I cannot solve. In the "Logs" section the webinterface shows the entries of /var/log/djigzo.log which is of course a symbolic link. But Djigzo doesn't display any entries for the MTA log. The file /var/log/mail exists and I have created a symbolic link called mail.log that points to /var/log/mail. Just to make sure, that it isn't a permission problem, I did a "chmod o+r /var/log/mail" but there are still no entries in the webinterface. Does anyone have an idea what logfile Djigzo is looking for or why it cannot read /var/log/mail? Thanks for any hints/suggestions, Stefan