Hi Zhang,
Here is the output for your reference.
[root@mail log]# amavisd debug-sa
May 23 15:45:16.877 mail.mydomain.com /usr/sbin/amavisd[11088]: starting. /usr/sbin/amavisd at mail.mydomain.com amavisd-new-2 .6.4 (20090625), Unicode aware, LANG="en_US.UTF-8"
May 23 15:45:16.877 mail.mydomain.com /usr/sbin/amavisd[11088]: Perl version 5.008008
May 23 15:45:17.103 mail.mydomain.com /usr/sbin/amavisd[11088]: Net::Server: Group Not Defined. Defaulting to EGID '159 159'
May 23 15:45:17.103 mail.mydomain.com /usr/sbin/amavisd[11088]: Net::Server: User Not Defined. Defaulting to EUID '103'
May 23 15:45:17.112 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Amavis::Conf 2.207
May 23 15:45:17.112 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Archive::Zip 1.26
May 23 15:45:17.112 mail.mydomain.com /usr/sbin/amavisd[11088]: Module BerkeleyDB 0.36
May 23 15:45:17.112 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Compress::Zlib 2.03
May 23 15:45:17.112 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Convert::TNEF 0.17
May 23 15:45:17.112 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Convert::UUlib 1.11
May 23 15:45:17.113 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Crypt::OpenSSL::RSA 0.25
May 23 15:45:17.113 mail.mydomain.com /usr/sbin/amavisd[11088]: Module DBD::mysql 4.008
May 23 15:45:17.113 mail.mydomain.com /usr/sbin/amavisd[11088]: Module DBI 1.52
May 23 15:45:17.113 mail.mydomain.com /usr/sbin/amavisd[11088]: Module DB_File 1.814
May 23 15:45:17.113 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Digest::MD5 2.36
May 23 15:45:17.113 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Digest::SHA 5.47
May 23 15:45:17.113 mail.mydomain.com /usr/sbin/amavisd[11088]: Module IO::Socket::INET6 2.51
May 23 15:45:17.114 mail.mydomain.com /usr/sbin/amavisd[11088]: Module MIME::Entity 5.420
May 23 15:45:17.114 mail.mydomain.com /usr/sbin/amavisd[11088]: Module MIME::Parser 5.420
May 23 15:45:17.114 mail.mydomain.com /usr/sbin/amavisd[11088]: Module MIME::Tools 5.420
May 23 15:45:17.114 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Mail::DKIM::Signer 0.36
May 23 15:45:17.114 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Mail::DKIM::Verifier 0.36
May 23 15:45:17.114 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Mail::Header 2.04
May 23 15:45:17.114 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Mail::Internet 2.04
May 23 15:45:17.115 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Mail::SPF v2.006
May 23 15:45:17.115 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Mail::SpamAssassin 3.003001
May 23 15:45:17.115 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Net::DNS 0.59
May 23 15:45:17.115 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Net::LDAP 0.33
May 23 15:45:17.116 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Net::Server 0.97
May 23 15:45:17.116 mail.mydomain.com /usr/sbin/amavisd[11088]: Module NetAddr::IP 4.027
May 23 15:45:17.116 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Socket6 0.19
May 23 15:45:17.116 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Time::HiRes 1.9717
May 23 15:45:17.116 mail.mydomain.com /usr/sbin/amavisd[11088]: Module URI 1.35
May 23 15:45:17.116 mail.mydomain.com /usr/sbin/amavisd[11088]: Module Unix::Syslog 1.0
May 23 15:45:17.117 mail.mydomain.com /usr/sbin/amavisd[11088]: Amavis::DB code loaded
May 23 15:45:17.117 mail.mydomain.com /usr/sbin/amavisd[11088]: Amavis::Cache code loaded
May 23 15:45:17.117 mail.mydomain.com /usr/sbin/amavisd[11088]: SQL base code loaded
May 23 15:45:17.117 mail.mydomain.com /usr/sbin/amavisd[11088]: SQL::Log code loaded
May 23 15:45:17.117 mail.mydomain.com /usr/sbin/amavisd[11088]: SQL::Quarantine NOT loaded
May 23 15:45:17.117 mail.mydomain.com /usr/sbin/amavisd[11088]: Lookup::SQL code NOT loaded
May 23 15:45:17.117 mail.mydomain.com /usr/sbin/amavisd[11088]: Lookup::LDAP code loaded
May 23 15:45:17.117 mail.mydomain.com /usr/sbin/amavisd[11088]: AM.PDP-in proto code loaded
May 23 15:45:17.117 mail.mydomain.com /usr/sbin/amavisd[11088]: SMTP-in proto code loaded
May 23 15:45:17.117 mail.mydomain.com /usr/sbin/amavisd[11088]: Courier proto code NOT loaded
May 23 15:45:17.117 mail.mydomain.com /usr/sbin/amavisd[11088]: SMTP-out proto code loaded
May 23 15:45:17.117 mail.mydomain.com /usr/sbin/amavisd[11088]: Pipe-out proto code NOT loaded
May 23 15:45:17.117 mail.mydomain.com /usr/sbin/amavisd[11088]: BSMTP-out proto code NOT loaded
May 23 15:45:17.118 mail.mydomain.com /usr/sbin/amavisd[11088]: Local-out proto code loaded
May 23 15:45:17.118 mail.mydomain.com /usr/sbin/amavisd[11088]: OS_Fingerprint code NOT loaded
May 23 15:45:17.118 mail.mydomain.com /usr/sbin/amavisd[11088]: ANTI-VIRUS code loaded
May 23 15:45:17.118 mail.mydomain.com /usr/sbin/amavisd[11088]: ANTI-SPAM code loaded
May 23 15:45:17.118 mail.mydomain.com /usr/sbin/amavisd[11088]: ANTI-SPAM-EXT code NOT loaded
May 23 15:45:17.118 mail.mydomain.com /usr/sbin/amavisd[11088]: ANTI-SPAM-C code NOT loaded
May 23 15:45:17.118 mail.mydomain.com /usr/sbin/amavisd[11088]: ANTI-SPAM-SA code loaded
May 23 15:45:17.118 mail.mydomain.com /usr/sbin/amavisd[11088]: Unpackers code loaded
May 23 15:45:17.118 mail.mydomain.com /usr/sbin/amavisd[11088]: DKIM code loaded
May 23 15:45:17.118 mail.mydomain.com /usr/sbin/amavisd[11088]: Tools code NOT loaded
May 23 15:45:17.118 mail.mydomain.com /usr/sbin/amavisd[11088]: Found $file at /usr/bin/file
May 23 15:45:17.118 mail.mydomain.com /usr/sbin/amavisd[11088]: Found $altermime at /usr/bin/altermime
May 23 15:45:17.119 mail.mydomain.com /usr/sbin/amavisd[11088]: Internal decoder for .mail
May 23 15:45:17.119 mail.mydomain.com /usr/sbin/amavisd[11088]: Internal decoder for .asc
May 23 15:45:17.119 mail.mydomain.com /usr/sbin/amavisd[11088]: Internal decoder for .uue
May 23 15:45:17.119 mail.mydomain.com /usr/sbin/amavisd[11088]: Internal decoder for .hqx
May 23 15:45:17.119 mail.mydomain.com /usr/sbin/amavisd[11088]: Internal decoder for .ync
May 23 15:45:17.119 mail.mydomain.com /usr/sbin/amavisd[11088]: Found decoder for .F at /usr/bin/unfreeze
May 23 15:45:17.119 mail.mydomain.com /usr/sbin/amavisd[11088]: Found decoder for .Z at /usr/bin/uncompress
May 23 15:45:17.119 mail.mydomain.com /usr/sbin/amavisd[11088]: Found decoder for .gz at /usr/bin/gzip -d
May 23 15:45:17.119 mail.mydomain.com /usr/sbin/amavisd[11088]: Found decoder for .bz2 at /usr/bin/bzip2 -d
May 23 15:45:17.119 mail.mydomain.com /usr/sbin/amavisd[11088]: Found decoder for .lzo at /usr/bin/lzop -d
May 23 15:45:17.120 mail.mydomain.com /usr/sbin/amavisd[11088]: Found decoder for .rpm at /usr/bin/rpm2cpio
May 23 15:45:17.120 mail.mydomain.com /usr/sbin/amavisd[11088]: Found decoder for .cpio at /usr/bin/pax
May 23 15:45:17.120 mail.mydomain.com /usr/sbin/amavisd[11088]: Found decoder for .tar at /usr/bin/pax
May 23 15:45:17.120 mail.mydomain.com /usr/sbin/amavisd[11088]: Found decoder for .deb at /usr/bin/ar
May 23 15:45:17.120 mail.mydomain.com /usr/sbin/amavisd[11088]: Internal decoder for .zip
May 23 15:45:17.120 mail.mydomain.com /usr/sbin/amavisd[11088]: No decoder for .7z tried: 7zr, 7za, 7z
May 23 15:45:17.120 mail.mydomain.com /usr/sbin/amavisd[11088]: Found decoder for .rar at /usr/bin/unrar
May 23 15:45:17.120 mail.mydomain.com /usr/sbin/amavisd[11088]: Found decoder for .arj at /usr/bin/arj
May 23 15:45:17.121 mail.mydomain.com /usr/sbin/amavisd[11088]: Found decoder for .arc at /usr/bin/nomarch
May 23 15:45:17.121 mail.mydomain.com /usr/sbin/amavisd[11088]: Found decoder for .zoo at /usr/bin/zoo
May 23 15:45:17.121 mail.mydomain.com /usr/sbin/amavisd[11088]: Found decoder for .lha at /usr/bin/lha
May 23 15:45:17.121 mail.mydomain.com /usr/sbin/amavisd[11088]: Found decoder for .cab at /usr/bin/cabextract
May 23 15:45:17.121 mail.mydomain.com /usr/sbin/amavisd[11088]: No decoder for .tnef tried: tnef
May 23 15:45:17.121 mail.mydomain.com /usr/sbin/amavisd[11088]: Internal decoder for .tnef
May 23 15:45:17.121 mail.mydomain.com /usr/sbin/amavisd[11088]: Found decoder for .exe at /usr/bin/unrar; /usr/bin/lha; /usr/bin /arj
May 23 15:45:17.121 mail.mydomain.com /usr/sbin/amavisd[11088]: Using primary internal av scanner code for ClamAV-clamd
May 23 15:45:17.122 mail.mydomain.com /usr/sbin/amavisd[11088]: Found secondary av scanner ClamAV-clamscan at /usr/bin/clamscan
May 23 15:45:17.123 mail.mydomain.com /usr/sbin/amavisd[11088]: Creating db in /var/amavis/db/; BerkeleyDB 0.36, libdb 4.3
May 23 15:45:47.882 mail.mydomain.com /usr/sbin/amavisd[11095]: (11095-01) Passed CLEAN, MYNETS/MYUSERS LOCAL [xxx.xxx.xxx.xxx] [172.16. 1.13] <backup@mydomain.com> -> <backup@mydomain.com>, Message-ID: <4FBCF827.7020208@mydomain.com>, mail_id: P4K+fvLs8Cf6, Hits: -10, size: 574, queued_as: D1FB042601E8, 247 ms
May 23 15:45:47.884 mail.mydomain.com /usr/sbin/amavisd[11096]: (11096-01) Passed CLEAN, MYNETS/MYUSERS LOCAL [xxx.xxx.xxx.xxx] [172.16. 1.13] <backup@mydomain.com> -> <ketan@otherdomain.com>, Message-ID: <4FBCF827.7020208@mydomain.com>, mail_id: rsMXnuMryDlc, Hits : -10, size: 574, queued_as: D2E4F42601E9, 247 ms