Reading the documentation Improving Anti-spam system - Zimbra :: Wiki (some revision in discussion http://www.zimbra.com/forums/adminis...ocal-cf.html#2); it seems that there are 2 ways to put whitelist or blacklist: in SpamAssassin's configuration under conf/spamassassin directory or as Perl hash in Amavis configuration file (amavisd.conf.in).

What is the differences, advantage and disadvantages of each method?

Thank you!