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
其他技巧：
1． 单封邮件与单个邮件信箱的大小限制(单位Bytes)
# Vi /etc/postfix/main.cf
message_size_limit = 40000000 mailbox_size_limit = 1000000000 # postfix reload