Postfix
“UNKNOWN 後失去連接”（OpenDKIM + postfix 接收電子郵件）
opendkim在安裝帶有免費證書的 TLS之前，我有一個可以正常工作的郵件伺服器StartSSL，Thunderbird 可以正確連接以發送/接收電子郵件。我的發行版是Debian 8。然而，安裝後
opendkim我可以發送經過驗證的電子郵件，但我既不能接收（見下面的錯誤）也不能出於某種原因在點擊“獲取郵件”後 Thunderbird 不再檢索電子郵件：mail.log（證書共享後的最後一個重要部分，電子郵件來自您發送電子郵件的服務，它將回復有關您的 DKIM/etc 的資訊，對我來說是一個簡單的可重複測試）：
Dec 11 02:11:18 amur postfix/smtpd[2452]: Read 22 chars: EHLO [168.144.32.46]?? Dec 11 02:11:18 amur postfix/smtpd[2452]: Write 180 chars: 250-li211-32.members.linode.com??250-PIP Dec 11 02:11:18 amur postfix/smtpd[2452]: write to 555895BAD5D0 [555895D2C973] (261 bytes => 261 (0x105)) Dec 11 02:11:18 amur postfix/smtpd[2452]: 0000 17 03 03 01 00 ea fd b3|cf f4 f5 2e 90 95 e2 5f ........ ......._ Dec 11 02:11:18 amur postfix/smtpd[2452]: 0010 ea 38 64 3a 4d c4 45 aa|45 4e 85 08 48 b9 0e c8 .8d:M.E. EN..H... Dec 11 02:11:18 amur postfix/smtpd[2452]: 0020 ba 8a 30 62 60 5a 45 d4|ee df 9d 25 de 15 d0 ba ..0b`ZE. ...%.... Dec 11 02:11:18 amur postfix/smtpd[2452]: 0030 89 09 f4 57 c0 02 42 e3|0e 8c 6c 0e 79 ce 1b 68 ...W..B. ..l.y..h Dec 11 02:11:18 amur postfix/smtpd[2452]: 0040 20 d3 d1 d9 27 23 d2 bf|58 71 96 23 a9 85 24 9e ...'#.. Xq.#..$. Dec 11 02:11:18 amur postfix/smtpd[2452]: 0050 02 14 6b 87 dd aa f8 78|14 62 0f ca e5 cd fd 55 ..k....x .b.....U Dec 11 02:11:18 amur postfix/smtpd[2452]: 0060 46 05 bc 7b 48 c4 2d 36|54 cf 59 97 b8 b9 f1 5e F..{H.-6 T.Y....^ Dec 11 02:11:18 amur postfix/smtpd[2452]: 0070 ef 0a 4c 1d 90 82 30 4f|e4 e8 19 19 42 1f 00 1c ..L...0O ....B... Dec 11 02:11:18 amur postfix/smtpd[2452]: 0080 76 01 b6 d1 ad fe 62 3e|47 3b e6 bf e1 b9 fc de v.....b> G;...... Dec 11 02:11:18 amur postfix/smtpd[2452]: 0090 03 4e a4 df e1 36 ca 24|64 8b 54 08 74 98 4f f0 .N...6.$ d.T.t.O. Dec 11 02:11:18 amur postfix/smtpd[2452]: 00a0 64 7f 90 53 87 2f 95 4e|ee b7 a0 fe d2 03 87 74 d..S./.N .......t Dec 11 02:11:18 amur postfix/smtpd[2452]: 00b0 7d 47 25 33 80 da bf 20|3b bb d2 a1 76 e0 6f 00 }G%3... ;...v.o. Dec 11 02:11:18 amur postfix/smtpd[2452]: 00c0 31 90 48 94 0e 57 a5 1d|fc 69 b5 e6 ed f4 ff ce 1.H..W.. .i...... Dec 11 02:11:18 amur postfix/smtpd[2452]: 00d0 09 74 ea c3 de 92 4b d1|d6 76 d0 10 0a 24 4c bc .t....K. .v...$L. Dec 11 02:11:18 amur postfix/smtpd[2452]: 00e0 43 9b 3e e2 32 a0 f5 a4|6a 6d 4b be a0 a7 04 ef C.>.2... jmK..... Dec 11 02:11:18 amur postfix/smtpd[2452]: 00f0 5d 84 03 71 b6 a9 af f3|6f 7c 3f 5f c0 a2 7f 7f ]..q.... o|?_.... Dec 11 02:11:18 amur postfix/smtpd[2452]: 0100 25 d7 5a 56 4e %.ZVN Dec 11 02:11:18 amur postfix/smtpd[2452]: read from 555895BAD5D0 [555895D24423] (5 bytes => -1 (0xFFFFFFFFFFFFFFFF)) Dec 11 02:11:18 amur postfix/smtpd[2454]: initializing the server-side TLS engine Dec 11 02:11:18 amur postfix/smtpd[2454]: connect from unlocktheinbox.com[168.144.32.45] Dec 11 02:11:18 amur postfix/smtpd[2454]: lost connection after UNKNOWN from unlocktheinbox.com[168.144.32.45] Dec 11 02:11:18 amur postfix/smtpd[2454]: disconnect from unlocktheinbox.com[168.144.32.45] Dec 11 02:11:18 amur postfix/smtpd[2452]: read from 555895BAD5D0 [555895D24423] (5 bytes => 0 (0x0)) Dec 11 02:11:18 amur postfix/smtpd[2452]: lost connection after EHLO from mail.unlocktheinbox.com[168.144.32.46] Dec 11 02:11:18 amur postfix/smtpd[2452]: disconnect from mail.unlocktheinbox.com[168.144.32.46]
postfix在 chroot 中執行，我試圖將 opendkim 的套接字保留在那裡。這是我的 postconf -n 輸出：
alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no broken_sasl_auth_clients = yes config_directory = /etc/postfix inet_interfaces = all mailbox_command = procmail -a "$EXTENSION" mailbox_size_limit = 0 milter_default_action = accept milter_protocol = 2 mydestination = li211-32.members.linode.com, localhost.members.linode.com, localhost myhostname = li211-32.members.linode.com mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 myorigin = /etc/mailname non_smtpd_milters = $smtpd_milters queue_directory = /var/spool/postfix readme_directory = no recipient_delimiter = + relayhost = smtp_tls_CAfile = /etc/postfix/ssl/ca-bundle.crt smtp_tls_cert_file = /etc/nginx/conf.d/ssl-unified.crt smtp_tls_key_file = /etc/nginx/conf.d/ssl.key smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) smtpd_delay_reject = yes smtpd_milters = unix:/var/run/opendkim/opendkim.sock smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination smtpd_sasl_auth_enable = yes smtpd_sasl_local_domain = <mysite.com> smtpd_sasl_path = private/auth smtpd_sasl_security_options = noanonymous smtpd_sasl_tls_security_options = $smtpd_sasl_security_options smtpd_sasl_type = dovecot smtpd_sender_login_maps = mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf smtpd_tls_CAfile = /etc/postfix/ssl/ca-bundle.crt smtpd_tls_ask_ccert = yes smtpd_tls_auth_only = yes smtpd_tls_cert_file = /etc/nginx/conf.d/ssl-unified.crt smtpd_tls_key_file = /etc/nginx/conf.d/ssl.key smtpd_tls_loglevel = 4 smtpd_tls_received_header = yes smtpd_tls_security_level = may smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_tls_session_cache_timeout = 3600s smtpd_use_tls = yes tls_random_source = dev:/dev/urandom virtual_alias_maps = mysql:/etc/postfix/mysql-virtual-alias-maps.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要完整，opendkim.conf 和 default/opendkim
Syslog yes UMask 0002 UserID opendkim:opendkim #within group of postfix ExternalIgnoreList refile:/etc/opendkim/TrustedHosts InternalHosts refile:/etc/opendkim/TrustedHosts KeyTable refile:/etc/opendkim/KeyTable SigningTable refile:/etc/opendkim/SigningTable AutoRestart yes AutoRestartRate 10/1h Background yes Canonicalization relaxed/relaxed DNSTimeout 5 Mode sv SignatureAlgorithm rsa-sha256 SubDomains no X-Header no PidFile local:/var/spool/postfix/var/run/opendkim/opendkim.pid Statistics /var/log/dkim-filter/dkim-stats和
SOCKET="local:/var/spool/postfix/var/run/opendkim/opendkim.sock"chroot 和 nonchroot opendkim.sock/pid 都歸擁有
opendkim並具有適當的權限。幾十個小時才能走到這一步……
與 dkim 相關，我認為這是一些時髦的錯誤……但沒有指南我可以複製任何其他問題（第二次我得到 .sock 文件以正確的權限讀取並找到，它在 UNKNOWN 下降後開始 no 。 )
這可能是因為 DKIM 的簡單失敗不能用後綴解釋，而這就是未知的原因嗎？有小費嗎？
我該如何調試 DKIM？
（我也在使用埠 587，我相信埠 25 出於某種原因無法訪問。即使早前它可用。）
請注意，埠 25 必須打開：伺服器之間的通信使用此埠完成。檢查防火牆、路由器，
nmap並netstat找出無法訪問的原因。587 埠（送出）僅適用於經過身份驗證的使用者，因此他們可以通過伺服器發送郵件。