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Postfix 拒绝所有中继域目的地（relay_domains 除外）

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Postfix 拒绝所有中继域目的地（relay_domains 除外）

我正在运行带有 Postfix 3.5.17 的 Debian 11，并且我在限制客户端可以将邮件中继到的域（来自提交的邮件）时遇到问题。

我已将relay_domains 配置为仅是我想要将邮件中继到的特定域，但如果我向domain.com 发送测试消息，日志会显示其与其的连接，尽管它不在relay_domains 中。

看来relay_domains现在实际上并没有拒绝任何东西，是否需要额外的配置选项或限制才能使其生效？

后会议-n：

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
anvil_rate_time_unit = 60s
append_dot_mydomain = no
biff = no
compatibility_level = 2
default_destination_rate_delay = 5s
disable_vrfy_command = yes
inet_interfaces = all
inet_protocols = all
invalid_hostname_reject_code = 550
mailbox_size_limit = 0
maximal_backoff_time = 3h
minimal_backoff_time = 180s
mydestination = localhost
mydomain = localmail.com
myhostname = localmail.com
mynetworks = 127.0.0.0/8 172.20.0.0/16 10.10.0.0/16 192.168.0.0/16
myorigin = $mydomain
non_fqdn_reject_code = 550
readme_directory = no
recipient_delimiter = +
relay_domains = protonmail.com, protonmail.ch, mail.protonmail.ch, mailsec.protonmail.ch
relayhost =
smtp_always_send_ehlo = yes
smtp_helo_timeout = 15s
smtp_rcpt_timeout = 15s
smtp_tls_security_level = encrypt
smtpd_banner = $myhostname ESMTP $mail_name
smtpd_client_message_rate_limit = 10
smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated,
smtpd_delay_reject = yes
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname
smtpd_recipient_limit = 40
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_recipient, reject_unknown_recipient_domain, reject_unlisted_recipient, reject_unauth_destination
smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, defer_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_path = private/auth
smtpd_sasl_security_options = noanonymous, noplaintext
smtpd_sasl_tls_security_options = noanonymous
smtpd_sasl_type = dovecot
smtpd_sender_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_sender, reject_unknown_sender_domain
smtpd_timeout = 30s
smtpd_tls_auth_only = yes
smtpd_tls_cert_file = /etc/ssl/certs/mailtls-selfsigned.crt
smtpd_tls_key_file = /etc/ssl/private/mailtls-selfsigned.key
smtpd_tls_security_level = encrypt
smtpd_use_tls = yes
strict_rfc821_envelopes = yes
unknown_address_reject_code = 550
unknown_client_reject_code = 550
unknown_hostname_reject_code = 550
unverified_recipient_reject_code = 550
unverified_sender_reject_code = 550
virtual_alias_maps = mysql:/etc/postfix/mysql-virtual-alias-maps.cf, mysql:/etc/postfix/mysql-virtual-email2email.cf
virtual_mailbox_domains = mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf
virtual_transport = lmtp:unix:private/dovecot-lmtp

答案1

限制的顺序很重要，第一个匹配的规则获胜。

因为您没有permit_mynetworks任何其他限制，所以允许本地网络上的主机中继到任何地方。同样，您有permit_sasl_authenticated第二个限制，它允许经过身份验证的客户端中继到任何域。

如果您不想这样，请放置reject_unauth_destination 前 permit_mynetworks和permit_sasl_authenticated。

从man 5 postconf：

reject_unauth_destination

除非满足以下条件之一，否则拒绝请求：

  • Postfix 是一个邮件转发器：解析的 RCPT TO 域匹配 $relay_domains或其子域，并且不包含发件人指定的路由（user@elsewhere@domain），

  • Postfix 是最终目的地：解析后的 RCPT TO 域与$mydestination、$inet_interfaces、$proxy_interfaces、 $virtual_alias_domains或匹配$virtual_mailbox_domains，并且不包含发件人指定的路由 (user@elsewhere@domain)。

该relay_domains_reject_code参数指定拒绝请求的响应代码（默认值：554）。

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