方法如下，编辑/../etc/postfix/mail.cf文件，加入：
smtpd_sender_restrictions = check_sender_access regexp:/../etc/postfix/blackdynamiclist
保存，
建立/../etc/postfix/blackdynamiclist文件，内容为：
# IP
# /^10.10.1.2$/ REJECT UCE black-listed
# IP block
# /^10.10.1/ REJECT UCE black-listed
# exact domain
# /^example.com$/ REJECT UCE black-listed
# everything in a domain
# /example.com$/ REJECT UCE black-listed
# specific hosts
# /^uce-relay.example.com$/ REJECT UCE black-listed
/dynamic/ REJECT UCE black-listed
/static/ REJECT UCE black-listed
/dsl/ REJECT UCE black-listed
/.dns0755.net$/ REJECT UCE black-listed
/.kmip.net$/ REJECT UCE black-listed
/.bjs.cn$/ REJECT UCE black-listed
/.dipns.net$/ REJECT UCE black-listed
/.hns.cn$/ REJECT UCE black-listed
/.gicp.net$/ REJECT UCE black-listed
/.88ip.net$/ REJECT UCE black-listed
/.vicp.cc$/ REJECT UCE black-listed
/.ip88.net$/ REJECT UCE black-listed
/.tjs.cn$/ REJECT UCE black-listed
/.jxs.cn$/ REJECT UCE black-listed
/.5166.info$/ REJECT UCE black-listed
/.51vip.biz$/ REJECT UCE black-listed
/.dipns.com$/ REJECT UCE black-listed
/.sds.cn$/ REJECT UCE black-listed
/.rr.com$/ REJECT UCE black-listed
/.8800.org$/ REJECT UCE black-listed
/.cable.virginmedia.com$/ REJECT UCE black-listed
/.xicp.net$/ REJECT UCE black-listed
/.9966.org$/ REJECT UCE black-listed
保存，
“#”字符后是注释，要加新的特征可以参考其写法
之后运行：
postfix reload就可以了！
通过运行：
tail -f /var/log/maillog命令可以实时看到邮件的收发记录，经常会看到：
NOQUEUE: reject: RCPT from unknown[xxx.xxx.xxx.xx]: 554 5.7.1 <[email protected]>: Sender address rejected: UCE black-listed…的信息，感觉整个世界都清静了许多！