限制部分Postfix用户只能内部收发的例子（完整版）
1）在main.cf里定义如下的smtpd_restriction_classes：# restrictionssmtpd_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, reject2）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,3）编辑/etc/postfix/local_in_senders：foo@extmail.org local_in_only
bar@extmail.org local_in_only4）编辑/etc/postifx/local_out_senders：foo@extmail.org local_out_only
bar@extmail.org local_out_only5）编辑/etc/postfix/local_domains：internal.foo.com OK
internal.bar.com OK6）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这样就定义了extmail.org域名里两个用户foo和bar，只允许和internal.foo.com和internel.bar.com 两个内部域的用户来往邮件，对于外部的邮件则没有收或发的能力。如果外部邮件企图给这2个用户发送，则遇到如下错误：554 5.7.1 <foo@extmail.org>: Recipient address rejected: Access denied如果这2个内部用户要给外部用户发email，将遇到如下错误：554 5.7.1 <bar@extmail.org>: Sender address rejected: Access denied 目前这样的配置就可以比较完整的实现内部用户的功能需求了。其实这种配置的方法和之前的帖子道理一样，关键得分清楚什么阶段，调用什么restrictions即可。
转自：http://www.extmail.org/forum/viewthread.php?tid=6447
service postfix restart
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