postfix内部邮件管理的配置方法，有需要的朋友可以参考下。
邮件组限定修改顺序：
1）在main.cf里定义如下的smtpd_restriction_classes：
# restrictions--mail police
smtpd_restriction_classes = local_out_only local_in_only
local_out_only = check_recipient_access hash:/etc/postfix/local_domains, reject
local_in_only = check_sender_access hash:/etc/postfix/local_domains, reject
2）将main.cf里的smtpd_recipient_restrctions定义为：
smtpd_recipient_restrictions =
check_sender_access hash:/etc/postfix/local_out_senders
check_recipient_access hash:/etc/postfix/local_in_senders
permit_mynetworks,
permit_sasl_authenticated,
reject_non_fqdn_hostname,
reject_non_fqdn_sender,
reject_non_fqdn_recipient,
reject_unauth_destination,
reject_unauth_pipelining,
reject_invalid_hostname
check_policy_service inet:127.0.0.1:10030
3）编辑/etc/postfix/local_in_senders：引用（每一行为一个邮件组）:
all@oxoxoox.com local_in_only
bpp@oxoxoox.com local_in_only
4）编辑/etc/postifx/local_out_senders：
目前对于出去的组还没有限定，故为空！！此选项的意思是在oxoxoox邮件组里面有非oxoxoox.com.cn的邮箱时，比如有oxoxoox.com的邮箱，如果做了限定将会无法收到。
5）编辑/etc/postfix/local_domains：
oxoxoox.com.cn OK
oxoxoox.com OK
6）为3，4，5建立对应的hash文件：
# postmap hash:/etc/postfix/local_in_senders
# postmap hash:/etc/postfix/local_out_senders
# postmap hash:/etc/postfix/local_domains