Linux
後綴：拒絕reject_unknown_recipient_domain 並接收即時電子郵件通知
當電子郵件發送到不存在的域或收件人時，我希望發件人立即收到來自 mailer-daemon 的電子郵件，通知收件人不存在。
實際上，在我的系統上發生的事情是電子郵件進入延遲隊列並在配置中指定的時間停留在那裡。正如我
delay_warning_time = 30m在隊列中 30 分鐘後設置的那樣，發件人會收到通知，但這不是我想要的不存在的地址。我想要的是立即拒絕電子郵件並通知發件人。有誰知道我做錯了什麼？多謝
目前，不存在的收件人電子郵件站在後綴隊列中：
# 郵件 -Queue ID---Size-- ----到達時間---- -Sender/Recipient----- AA6CA48DCC 1496 2 月 12 日星期三 12:56:36 user@domain.com （連接到 mx.email-srv.com[199.231.85.98]:25：連接超時） foo@gmai.com 6FF9948DFF 1498 2 月 12 日星期三 13:07:04 user@domain.com （連接到 mx.email-srv.com[199.231.85.98]:25：連接超時） foo@gmai.com這是我的後綴配置：
2bounce_notice_recipient = $delay_notice_recipient alias_database = hash:/etc/postfix/aliases alias_maps = hash:/etc/postfix/aliases broken_sasl_auth_clients = 否 command_directory = /usr/sbin config_directory = /etc/postfix content_filter = amavis:[127.0.0.1]:10024 daemon_directory = /usr/lib/postfix data_directory = /var/lib/postfix debug_peer_level = 2 debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5 delay_notice_recipient = 管理員 delay_warning_time = 30m disable_vrfy_command = 是 header_checks = 正則表達式：/etc/postfix/header_checks html_directory = 否 inet_interfaces = 所有 inet_protocols = 所有 local_recipient_maps = mail_owner = 後綴 mailq_path = /usr/bin/mailq.postfix manpage_directory = /usr/share/man masquerade_domains = mail.domain.es mail.domain.com hostname.domain.es hostname.domain.com maximum_backoff_time = 8000s maximal_queue_lifetime = 5d milter_default_action = 接受 軍事協議 = 2 minimum_backoff_time = 1000s 我的目的地 = mydomain = domain.es 我的主機名 = mail.domain.es mynetworks_style = 主機 myorigin = domain.es newaliases_path = /usr/bin/newaliases.postfix non_smtpd_milters = $smtpd_milters queue_directory = /var/spool/postfix 自述目錄 = /usr/share/doc/postfix-2.6.6/README_FILES 中繼主機 = relocated_maps = mysql:/etc/postfix/mysql_relocated.cf sample_directory = /usr/share/doc/postfix-2.6.6/samples sendmail_path = /usr/sbin/sendmail.postfix setgid_group = postdrop smtp_helo_timeout = 60s smtp_tls_CAfile = /etc/ssl/certs/sf_bundle.crt smtp_tls_note_starttls_offer = 是 smtp_tls_security_level = 可能 smtp_use_tls = 是 smtpd_banner = $myhostname ESMTP $mail_name smtpd_client_restrictions = reject_rbl_client sbl.spamhaus.org，reject_rbl_client blackholes.easynet.nl，reject_rbl_client dnsbl.njabl.org smtpd_data_restrictions = reject_unauth_pipelining smtpd_delay_reject = 是 smtpd_hard_error_limit = 12 smtpd_helo_required = 是 smtpd_helo_restrictions = permit_mynetworks、permit_sasl_authenticated、warn_if_reject reject_non_fqdn_hostname、reject_invalid_hostname、permit smtpd_milters = inet:localhost:8891 smtpd_recipient_limit = 16 smtpd_recipient_restrictions = reject_unauth_pipelining、permit_mynetworks、reject_non_fqdn_recipient、reject_unknown_recipient_domain、reject_unauth_destination、reject_unknown_helo_hostname、permit_sasl_authenticated、permit smtpd_sasl_auth_enable = 是 smtpd_sasl_local_domain = smtpd_sasl_security_options = 匿名 smtpd_sender_restrictions = permit_sasl_authenticated、permit_mynetworks、warn_if_reject reject_non_fqdn_sender、reject_unknown_sender_domain、reject_unauth_pipelining、permit smtpd_soft_error_limit = 3 smtpd_tls_cert_file = /etc/ssl/certs/domain.es.crt smtpd_tls_key_file = /etc/ssl/private/domain.key smtpd_tls_loglevel = 1 smtpd_tls_received_header = 是 smtpd_tls_security_level = 可能 smtpd_tls_session_cache_timeout = 3600s tls_random_source = dev:/dev/urandom transport_maps = mysql:/etc/postfix/mysql_transport.cf transport_retry_time = 30s unknown_local_recipient_reject_code = 450 virtual_alias_maps = mysql:/etc/postfix/mysql_alias.cf virtual_gid_maps = 靜態：5000 virtual_mailbox_base = /var/spool/mail/virtual virtual_mailbox_domains = mysql:/etc/postfix/mysql_domains.cf virtual_mailbox_maps = mysql:/etc/postfix/mysql_mailbox.cf virtual_uid_maps = 靜態：5000
postfix 應該如何知道電子郵件是否不存在，或者遠端伺服器是否不可用（您的隊列卡住的郵件似乎就是這種情況）。通常，postfix 會嘗試發送郵件，但除非它從遠端伺服器得到明確的答复，通常是 550 個答复（450 個範圍表示暫時不可用），postfix 無法確定郵件是否存在，或者是否存在是其他一些問題，可能允許稍後成功發送電子郵件。