将本地用户发出去的邮件不用 过滤和反垃圾

$policy_bank{'MYUSERS'} = {
    ...
    # don't perform spam/virus/header check.                                       
    #bypass_spam_checks_maps => [1],                                               
    #bypass_virus_checks_maps => [1],                                              
    #bypass_header_checks_maps => [1],                                             
                                                                                   
    # allow sending any file names and types                                       
    bypass_banned_checks_maps => [1],
    ...
}