基础工作
本文将讨论怎样配置Postfix(2.x和1.x)，在垃圾邮件进入服务器之前阻止它。不过，在将本文所讨论的方法运用到您的邮件服务器中之后，您应该检查您的邮件日志，确保合法的用户邮件不会被阻止。
您可以查看如下链接得到一些指导性的信息：
http://www.howtoforge.com/virtual_postfix_antispam
如下的链接包含另外一些反垃圾邮件解决方案：
http://www.howtoforge.com/taxonomy_menu/1/78/24
Postfix 2.x
打开/etc/postfix/main.cf文件，在其中增加如下的几行(如果相关的配置存在，就替换之):
vi /etc/postfix/main.cf
[...]
smtpd_helo_required = yes
disable_vrfy_command = yes
strict_rfc821_envelopes = yes
invalid_hostname_reject_code = 554
multi_recipient_bounce_reject_code = 554
non_fqdn_reject_code = 554
relay_domains_reject_code = 554
unknown_address_reject_code = 554
unknown_client_reject_code = 554
unknown_hostname_reject_code = 554
unknown_local_recipient_reject_code = 554
unknown_relay_recipient_reject_code = 554
unknown_sender_reject_code = 554
unknown_virtual_alias_reject_code = 554
unknown_virtual_mailbox_reject_code = 554
unverified_recipient_reject_code = 554
unverified_sender_reject_code = 554
smtpd_recipient_restrictions =
reject_invalid_hostname,
reject_unknown_recipient_domain,
reject_unauth_pipelining,
permit_mynetworks,
permit_sasl_authenticated,
reject_unauth_destination,
reject_rbl_client multi.uribl.com,
reject_rbl_client dsn.rfc-ignorant.org,
reject_rbl_client dul.dnsbl.sorbs.net,
reject_rbl_client list.dsbl.org,
reject_rbl_client sbl-xbl.spamhaus.org,
reject_rbl_client bl.spamcop.net,
reject_rbl_client dnsbl.sorbs.net,
reject_rbl_client cbl.abuseat.org,
reject_rbl_client ix.dnsbl.manitu.net,
reject_rbl_client combined.rbl.msrbl.net,
reject_rbl_client rabl.nuclearelephant.com,
permit
[...]
然后重新启动Postfix:
/etc/init.d/postfix restart
Postfix 1.x
打开/etc/postfix/main.cf，并在其中加入如下几行(如果相关的配置已经存在就替换之)：
vi /etc/postfix/main.cf
[...]
smtpd_helo_required = yes
disable_vrfy_command = yes
strict_rfc821_envelopes = yes
invalid_hostname_reject_code = 554
multi_recipient_bounce_reject_code = 554
non_fqdn_reject_code = 554
relay_domains_reject_code = 554
unknown_address_reject_code = 554
unknown_client_reject_code = 554
unknown_hostname_reject_code = 554
unknown_local_recipient_reject_code = 554
unknown_relay_recipient_reject_code = 554
unknown_sender_reject_code = 554
unknown_virtual_alias_reject_code = 554
unknown_virtual_mailbox_reject_code = 554
unverified_recipient_reject_code = 554
unverified_sender_reject_code = 554
maps_rbl_domains =
multi.uribl.com,
dsn.rfc-ignorant.org,
dul.dnsbl.sorbs.net,
list.dsbl.org,
sbl-xbl.spamhaus.org,
bl.spamcop.net,
dnsbl.sorbs.net,
cbl.abuseat.org,
ix.dnsbl.manitu.net,
combined.rbl.msrbl.net,
rabl.nuclearelephant.com
smtpd_recipient_restrictions =
permit_sasl_authenticated,
permit_mynetworks,
reject_invalid_hostname,
reject_non_fqdn_hostname,
reject_non_fqdn_sender,
reject_unknown_sender_domain,
reject_unknown_recipient_domain,
reject_maps_rbl,
check_relay_domains
[...]
然后重新启动Postfix:
/etc/init.d/postfix restart
