Bypass amavisd scan

最近遇到了信件被postfix裡的amavisd給誤判成垃圾信，因為此需要針對特定的Sender Address將它加入郵件過濾的白名單，設定方式如下：
先建立白名單列表
#vi /etc/amavisd/whitelist
test1@example.com   #針對特定使用者郵箱放行
test2@example.org
testexample.net                #針對特定某個網域放行
testexample.edu

修改amavisd的設定檔
#vi /etc/amavisd/amavisd.conf
#將原本的設定改為如下方所示
# This policy will perform virus checks only.
read_hash(\%whitelist_sender, '/etc/amavisd/whitelist');
@whitelist_sender_maps = (\%whitelist_sender);

$interface_policy{'10026'} = 'VIRUSONLY';
$policy_bank{'VIRUSONLY'} = { # mail from the pickup daemon
    bypass_spam_checks_maps   => ['@whitelist_sender_maps'],  # don't spam-check this mail
    bypass_banned_checks_maps => ['@whitelist_sender_maps'],  # don't banned-check this mail
    bypass_header_checks_maps => ['@whitelist_sender_maps'],  # don't header-check this mail
};

存檔後，重啟郵件服務，讀入新的設定白名單
# service policyd restart
# service amavisd restart
# service postfix restart

之後在白名單中寄件者或網域便不會經過spam filter的掃描機制而Bypass了
同一位寄件者發出來的信件，有過濾和沒過濾的差別在於**Spam**的標記