当两个不同的发件人尝试将邮件发送到本地托pipe在我的服务器上的帐户时，我看到上面提到的SMTP错误。 我的理想解决scheme是重写只有特定的发件人域或主机的限制。 我确实认识到他们的DNS设置不正确。 以前的讨论表明这是由我删除的reject_unknown_client指令触发的。 我仍然看到了同样的错误，所以最终我把所有reject_*指令都注释掉了，但拒绝继续。 这是我的*_restrictions部分在这一点的状态：
$ sudo postconf|grep ^smtpd_.*_restrictions smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, smtpd_data_restrictions = smtpd_end_of_data_restrictions = smtpd_etrn_restrictions = smtpd_helo_restrictions = smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_pipelining, reject_unknown_client_hostname,
以下是一个日志片段的例子：
Nov 22 17:41:10 mazer postfix/smtpd[27976]: warning: hostname mta5.edonor.com does not resolve to address 206.188.11.53 Nov 22 17:41:10 mazer postfix/smtpd[27976]: connect from unknown[206.188.11.53] Nov 22 17:41:11 mazer postfix/smtpd[27976]: NOQUEUE: reject: RCPT from unknown[206.188.11.53]: 450 4.7.1 Client host rejected: cannot find your hostname, [206.188.11.53]; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<mta5.edonor.com> Nov 22 17:41:11 mazer postfix/smtpd[27976]: disconnect from unknown[206.188.11.53] Nov 22 17:41:22 mazer postfix/postscreen[27975]: CONNECT from [107.0.162.226]:26151 to [204.246.122.100]:25
我完整的当前configuration：
alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes config_directory = /etc/postfix home_mailbox = Maildir/ inet_interfaces = all mailbox_command = /usr/lib/dovecot/deliver -c /etc/dovecot/dovecot.conf -m "${EXTENSION}" mailbox_size_limit = 0 mailman_destination_recipient_limit = 1 message_size_limit = 102400000 mydestination = mazer.squad51.net, localhost, localhost.localdomain, localhost myhostname = mazer.squad51.net mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 myorigin = /etc/mailname owner_request_special = no postscreen_dnsbl_action = drop postscreen_dnsbl_sites = zen.spamhaus.org b.barracudacentral.org bl.spamcop.net postscreen_dnsbl_threshold = 1 postscreen_greet_action = enforce readme_directory = no recipient_delimiter = + relay_domains = lists.squad51.net relayhost = smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtp_use_tls = yes smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, smtpd_helo_required = yes smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_pipelining, reject_unknown_client_hostname, smtpd_sasl_auth_enable = yes smtpd_sasl_authenticated_header = yes smtpd_sasl_local_domain = $myhostname smtpd_sasl_path = private/dovecot-auth smtpd_sasl_security_options = noanonymous smtpd_sasl_type = dovecot smtpd_sender_restrictions = smtpd_tls_auth_only = yes smtpd_tls_cert_file = /etc/ssl/certs/mail.squad51.net.crt smtpd_tls_key_file = /etc/ssl/private/mail.squad51.net.key smtpd_tls_mandatory_ciphers = medium smtpd_tls_mandatory_protocols = SSLv3, TLSv1 smtpd_tls_received_header = yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes tls_random_source = dev:/dev/urandom transport_maps = hash:/etc/postfix/transports virtual_alias_domains = emt-p.org virtual_alias_maps = hash:/etc/postfix/virtual