我每天会收到大约 50 封被拒绝的电子邮件，因为发送电子邮件地址有拼写错误，并且reject_unknown_sender_domain：
Jul 10 12:21:31 serverb3 postfix/smtpd[6647]: NOQUEUE: reject: RCPT from smtp.correctly-spelt-domain.co.uk[X.X.X.X]: 450 4.1.8 <[email protected]>: Sender address rejected: Domain not found; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<smtp.correctly-spelt-domain.co.uk>
我已添加[email protected] OK到/etc/postfix/sender_access，运行 postmap /etc/postfix/sender_access并重新启动 postfix。
尽管之前check_sender_access hash:/etc/postfix/sender_access出现在我的smtpd_recipient_restrictions列表中reject_unknown_sender_domain，但邮件仍因该原因被拒绝。这是为什么？我该如何解决？
Postfix v2.11.3
输出postconf -n：
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
biff = no
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/lib/postfix
disable_vrfy_command = yes
home_mailbox = Mail/
mailbox_command = /usr/lib/dovecot/deliver
mailbox_size_limit = 0
message_size_limit = 20480000
mydestination = b3.localdomain, localhost.localdomain, localhost, /etc/postfix/bubbadomains, $myhostname
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
recipient_delimiter = +
relayhost = smtp.gmail.com
sender_bcc_maps = hash:/etc/postfix/sender_bcc
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous
smtp_tls_session_cache_database = btree:${queue_directory}/smtp_scache
smtp_use_tls = yes
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
smtpd_helo_required = yes
smtpd_recipient_restrictions = permit_mynetworks check_sender_access hash:/etc/postfix/sender_access reject_unauth_destination reject_unauth_pipelining reject_invalid_hostname reject_non_fqdn_sender reject_unknown_sender_domain reject_non_fqdn_recipient reject_unknown_recipient_domain reject_rbl_client bl.spamcop.net reject_rbl_client zen.spamhaus.org reject_rbl_client dul.dnsbl.sorbs.net permit
smtpd_reject_unlisted_sender = yes
smtpd_relay_restrictions = permit_mynetworks reject_unauth_destination reject_unauth_pipelining reject_invalid_hostname reject_non_fqdn_sender reject_unknown_sender_domain reject_non_fqdn_recipient reject_unknown_recipient_domain check_sender_access hash:/etc/postfix/sender_access reject_rbl_client bl.spamcop.net reject_rbl_client zen.spamhaus.org reject_rbl_client dul.dnsbl.sorbs.net permit
smtpd_tls_cert_file = /etc/letsencrypt/live/mydomain.co.uk/fullchain.pem
smtpd_tls_key_file = /etc/letsencrypt/live/mydomain.co.uk/privkey.pem
smtpd_tls_session_cache_database = btree:${queue_directory}/smtpd_scache
smtpd_use_tls = yes
unknown_local_recipient_reject_code = 550
附言：我还尝试联系相关域名的所有者并通知他们，以解决根本原因。我并不指望他们能解决这个问题。
答案1
我从 Postfix 邮件列表中得到了答复：
您在“smtpd_relay_restrictions”中设置了“reject_unknown_sender_domain”，该设置先于“smtpd_recipient_restrictions”进行评估。请注意，拒绝会延迟到 RCPT TO。