很久以前我试图解决这个错误，但我仍然locking，我感谢任何帮助:)。
我详细介绍了我所拥有的以及我正在尝试做的事情。
我使用赛勒斯谋杀，显然一切工作正常，直到它试图将邮件传递到后端使用lmtp。
我有：
我用nslookup试过了DNS，效果很好。
在这两个服务器上的操作系统是： Debian 3.2.46-1 + deb7u1 i686 GNU / Linux。
我显示configuration文件，然后显示日志文件。
/etc/cyrus.conf（frontendlinux）
START { recover cmd="/usr/sbin/ctl_cyrusdb -r" idled cmd="idled" delprune cmd="/usr/sbin/cyr_expire -E 3" tlsprune cmd="/usr/sbin/tls_prune" } SERVICES { sieve cmd="timsieved" listen="sieve" prefork=0 maxchild=100 mupdate cmd="mupdate -m -T 1800" listen=3905 prefork=1 maxfds=1024000 maxforkrate=20 proto=tcp4 maxfds=256 -U 5 -T 10 imap cmd="proxyd" listen="imap" prefork=1 maxchild=100 maxforkrate=2 proto=tcp4 maxfds=256 -U 5 -T 10 lmtp cmd="lmtpproxyd" listen="lmtp" prefork=1 maxchild=20 maxforkrate=2 proto=tcp4 maxfds=256 -U 5 -T 10 lmtpunix cmd="lmtpproxyd" listen="/var/run/cyrus/socket/lmtp" prefork=1 maxchild=20 maxforkrate=2 maxfds=256 -U 5 -T 10 listen="/indicesimap/var/run/cyrus/socket/lmtp" prefork=1 notify cmd="notifyd" listen="/var/run/cyrus/socket/notify" proto="udp" prefork=1 } EVENTS { checkpoint cmd="/usr/sbin/ctl_cyrusdb -c" period=5 delprune cmd="/usr/sbin/cyr_expire -E 3" at=0401 tlsprune cmd="/usr/sbin/tls_prune" at=0401 delprune cmd="/usr/sbin/cyr_expire -X 14" at=0200 delprune cmd="/usr/sbin/cyr_expire -D 14" at=0400 } /etc/imapd.conf（frontendlinux）
configdirectory: /var/lib/cyrus partition-default: /var/spool/cyrus/mail allowusermoves: yes altnamespace: no unixhierarchysep: yes lmtp_downcase_rcpt: yes lmtp_over_quota_perm_failure: 0 admins: cyrus techforce-admin cyrmaster cyrlmtp mupdateuser lmtp_admins: mupdateuser postman cyrlmtp mupdate_admins: mupdateman mupdateuser imap_admins: cyrus mupdateuser techforce-admin proxy_authname: mupdateuser proxy_password: senha allowanonymouslogin: no popminpoll: 1 autocreatequota: 0 umask: 077 sendmail: /usr/sbin/sendmail sieveusehomedir: false sievedir: /var/spool/sieve hashimapspool: true allowplaintext: yes sasl_mech_list: PLAIN sasl_minimum_layer: 0 virtdomains: userid defaultdomain: ejemplo.org sasl_pwcheck_method: saslauthd auxprop sasl_auxprop_plugin: sasldb sasl_auto_transition: no tls_ca_path: /etc/postfix/sslcerts/ tls_session_timeout: 1440 tls_cipher_list: TLSv1+HIGH:!aNULL:@STRENGTH mupdate_server: frontendlinux mupdate_username: mupdateuser mupdate_authname: mupdateuser mupdate_password: senha lmtpsocket: /var/run/cyrus/socket/lmtp idlemethod: idled idlesocket: /var/run/cyrus/socket/idle syslog_prefix: cyrus statuscache_db: skiplist userdeny_db: skiplist skiplist_always_checkpoint: 1 singleinstancestore: 1 proxyd_disable_mailbox_referrals: 1 sieve_allowreferrals: 0 proxyd_allow_status_referral: 0 serverlist: backend backend_authname: mupdateuser backend_password: senha backend_mechs: PLAIN mupdate_config: standard partition-news: /var/spool/cyrus/news newsspool: /var/spool/news
/ etc / postfix / lmtp_passwd（frontendlinux）
169.254.220.13 mupdateuser:senha
并运行命令：su – postfix -c“/ usr / sbin / postmap / etc / postfix / lmtp_passwd”
/etc/postfix/main.cf（frontendlinux）
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) biff = no append_dot_mydomain = no readme_directory = no smtpd_tls_cert_file=/etc/postfix/sslcerts/linuxdrops.crt smtpd_tls_key_file=/etc/postfix/sslcerts/linuxdrops.key smtpd_use_tls=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache myhostname = frontendlinux alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases mydestination = localdomain, localhost, localhost.localdomain, localhost, ejemplo.org relayhost = mynetworks = 127.0.0.0/8 169.254.220.0/24 mailbox_size_limit = 20000000 recipient_delimiter = + inet_interfaces = all myorigin = /etc/mailname inet_protocols = ipv4 relay_domains = $myorigin smtpd_recipient_restrictions = permit_mynetworks, check_relay_domains mailbox_transport = lmtp:inet:169.254.220.13:lmtp local_recipient_maps = lmtp_sasl_auth_enable = yes lmtp_sasl_password_maps = hash:/etc/postfix/lmtp_passwd lmtp_sasl_security_options = noanonymous lmtp_sasl_mechanism_filter = plain lmtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated
/etc/postfix/master.cf（frontendlinux）
smtp inet n - - - - smtpd -v pickup fifo n - - 60 1 pickup cleanup unix n - - - 0 cleanup qmgr fifo n - n 300 1 qmgr tlsmgr unix - - - 1000? 1 tlsmgr rewrite unix - - - - - trivial-rewrite bounce unix - - - - 0 bounce defer unix - - - - 0 bounce trace unix - - - - 0 bounce verify unix - - - - 1 verify flush unix n - - 1000? 0 flush proxymap unix - - n - - proxymap proxywrite unix - - n - 1 proxymap smtp unix - - - - - smtp relay unix - - - - - smtp -o smtp_fallback_relay= showq unix n - - - - showq error unix - - - - - error retry unix - - - - - error discard unix - - - - - discard local unix - nn - - local virtual unix - nn - - virtual #lmtp unix - - - - - lmtp -v lmtp unix - - n - - lmtp -v anvil unix - - - - 1 anvil scache unix - - - - 1 scache maildrop unix - nn - - pipe flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient} uucp unix - nn - - pipe flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient) ifmail unix - nn - - pipe flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient) bsmtp unix - nn - - pipe flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient scalemail-backend unix - nn - 2 pipe flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension} mailman unix - nn - - pipe flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py ${nexthop} ${user}
/etc/postfix/sasl/smtpd.conf（frontendlinux）
pwcheck_method: saslauthd saslauthd_path: /var/run/saslauthd mech_list: PLAIN LOGIN log_level: 7
/etc/cyrus.conf（后端）
START { recover cmd="/usr/sbin/ctl_cyrusdb -r" mupdatepush cmd="/usr/sbin/ctl_mboxlist " delprune cmd="/usr/sbin/cyr_expire -E 3" tlsprune cmd="/usr/sbin/tls_prune" } SERVICES { imap cmd="imapd -U 30" listen="imap" prefork=1 maxchild=100 maxforkrate=20 proto=tcp4 maxfds=256 -U 5 -T 10 lmtp cmd="lmtpd" listen="backend:lmtp" prefork=1 maxchild=20 babysit=true maxforkrate=2 proto=tcp4 maxfds=256 -U 5 -T 10 sieve cmd="timsieved" listen="sieve" prefork=0 maxchild=100 notify cmd="notifyd" listen="/var/run/cyrus/socket/notify" proto="udp" prefork=1 } EVENTS { checkpoint cmd="/usr/sbin/ctl_cyrusdb -c" period=5 delprune cmd="/usr/sbin/cyr_expire -E 3" at=0401 tlsprune cmd="/usr/sbin/tls_prune" at=0401 delprune cmd="/usr/sbin/cyr_expire -X 14" at=0200 delprune cmd="/usr/sbin/cyr_expire -D 14" at=0400 }
/etc/imapd.conf（后端）
configdirectory: /var/lib/cyrus defaultpartition: default partition-default: /var/spool/cyrus/mail allowusermoves: yes allowallsubscribe: 1 duplicatesuppression: 1 expunge_mode: delayed partition-news: /var/spool/cyrus/news newsspool: /var/spool/news altnamespace: no unixhierarchysep: yes lmtp_downcase_rcpt: yes lmtp_over_quota_perm_failure: 0 admins: cyrus techforce-admin cyrmaster mupdateuser lmtp_admins: mupdateuser postman mupdate_admins: mupdateman mupdateuser imap_admins: cyrus mupdateuser techforce-admin proxyservers: mupdateuser cyrus proxy_authname: mupdateuser proxy_password: senha allowanonymouslogin: no popminpoll: 1 autocreatequota: 0 umask: 077 sendmail: /usr/sbin/sendmail sieveusehomedir: false sievedir: /var/spool/sieve hashimapspool: true allowplaintext: yes sasl_mech_list: PLAIN sasl_minimum_layer: 0 loginrealms: localhost ejemplo.org backend.ejemplo.org frontendlinux.ejemplo.org backend frontendlinux virtdomains: userid defaultdomain: ejemplo.org sasl_pwcheck_method: alwaystrue sasl_auxprop_plugin: sasldb sasl_auto_transition: no tls_ca_path: /etc/postfix/sslcerts/ tls_session_timeout: 1440 tls_cipher_list: TLSv1+HIGH:!aNULL:@STRENGTH mupdate_server: frontendlinux.ejemplo.org mupdate_username: mupdateuser mupdate_authname: mupdateuser mupdate_password: senha lmtpsocket: /var/run/cyrus/socket/lmtp idlesocket: /var/run/cyrus/socket/idle notifysocket: /var/run/cyrus/socket/notify syslog_prefix: cyrus statuscache_db: skiplist userdeny_db: skiplist skiplist_always_checkpoint: 1 singleinstancestore: 1 serverlist: backend backend_authname: mupdateuser backend_password: senha backend_mechs: PLAIN proxyd_disable_mailbox_referrals: 1 sieve_allowreferrals: 0 proxyd_allow_status_referral: 0
loginfrontendlinux
postfix/lmtp[3756]: deliver_request_get: file active/706B36086B postfix/lmtp[3756]: deliver_message: from [email protected] postfix/lmtp[3756]: smtp_parse_destination: 169.254.220.13:lmtp 24 postfix/lmtp[3756]: connecting to 169.254.220.13 port 24 postfix/lmtp[3756]: smtp_addr_one: host 169.254.220.13 postfix/lmtp[3756]: begin 169.254.220.13 address list postfix/lmtp[3756]: pref 0 host 169.254.220.13/169.254.220.13 postfix/lmtp[3756]: end 169.254.220.13 address list postfix/lmtp[3756]: smtp_connect_addr: trying: 169.254.220.13[169.254.220.13] port 24... cyrus/lmtp[3647]: telling master 2 cyrus/lmtp[3647]: accepted connection cyrus/lmtp[3647]: telling master 3 cyrus/master[3461]: service lmtp pid 3647 in READY state: now unavailable and in BUSY state cyrus/master[3461]: service lmtp now has 0 ready workers cyrus/master[3461]: service lmtp pid 3647 in BUSY state: now serving connection cyrus/master[3461]: service lmtp now has 0 ready workers cyrus/lmtp[3647]: connection from .ejemplo.org [169.254.220.13] postfix/lmtp[3756]: vstream_tweak_tcp: TCP_MAXSEG 16384 postfix/lmtp[3756]: global TLS level: none postfix/lmtp[3756]: smtp_stream_setup: maxtime=300 enable_deadline=0 postfix/lmtp[3756]: < 169.254.220.13[169.254.220.13]:24: 220 Cyrus LMTP Murder v2.4.16-Debian-2.4.16-4+deb7u1 server ready postfix/lmtp[3756]: > 169.254.220.13[169.254.220.13]:24: LHLO postfix/lmtp[3756]: < 169.254.220.13[169.254.220.13]:24: 250- postfix/lmtp[3756]: < 169.254.220.13[169.254.220.13]:24: 250-8BITMIME postfix/lmtp[3756]: < 169.254.220.13[169.254.220.13]:24: 250-ENHANCEDSTATUSCODES postfix/lmtp[3756]: < 169.254.220.13[169.254.220.13]:24: 250-PIPELINING postfix/lmtp[3756]: < 169.254.220.13[169.254.220.13]:24: 250-SIZE postfix/lmtp[3756]: < 169.254.220.13[169.254.220.13]:24: 250-AUTH PLAIN cyrus/master[3757]: set maximum file descriptors to 256/256 cyrus/mupdate[3520]: New worker thread started, for a total of 3 postfix/lmtp[3756]: < 169.254.220.13[169.254.220.13]:24: 250 IGNOREQUOTA postfix/lmtp[3756]: match_string: PLAIN ~? plain postfix/lmtp[3756]: server features: 0x102f size 0 postfix/lmtp[3756]: Using LMTP PIPELINING, TCP send buffer size is 170840, PIPELINING buffer size is 4096 cyrus/master[3757]: about to exec /usr/lib/cyrus/bin/lmtpproxyd postfix/lmtp[3756]: maps_find: smtp_sasl_passwd: hash:/etc/postfix/lmtp_passwd(0,lock|fold_fix): 169.254.220.13 = mupdateuser:senha postfix/lmtp[3756]: smtp_sasl_passwd_lookup: host `169.254.220.13' user `mupdateuser' pass `senha' postfix/lmtp[3756]: starting new SASL client postfix/lmtp[3756]: name_mask: noanonymous postfix/lmtp[3756]: smtp_sasl_authenticate: 169.254.220.13[169.254.220.13]:24: SASL mechanisms PLAIN postfix/lmtp[3756]: xsasl_cyrus_client_get_user: mupdateuser postfix/lmtp[3756]: xsasl_cyrus_client_get_passwd: senha postfix/lmtp[3756]: xsasl_cyrus_client_first: uncoded initial reply: \0mupdateuser\0senha postfix/lmtp[3756]: > 169.254.220.13[169.254.220.13]:24: AUTH PLAIN AG11cGRhdGV1c2VyAHNlbmhh cyrus/lmtp[3647]: login: .ejemplo.org [169.254.220.13] mupdateuser PLAIN User logged in postfix/lmtp[3756]: < 169.254.220.13[169.254.220.13]:24: 235 Authenticated! postfix/lmtp[3756]: smtp_stream_setup: maxtime=300 enable_deadline=0 postfix/lmtp[3756]: > 169.254.220.13[169.254.220.13]:24: MAIL FROM:<[email protected]> SIZE=526 postfix/lmtp[3756]: > 169.254.220.13[169.254.220.13]:24: RCPT TO:<[email protected]> postfix/lmtp[3756]: > 169.254.220.13[169.254.220.13]:24: DATA postfix/lmtp[3756]: smtp_stream_setup: maxtime=300 enable_deadline=0 cyrus/mupdate[3520]: cmd_find(fd:18, user.user1) postfix/lmtp[3756]: < 169.254.220.13[169.254.220.13]:24: 250 2.1.0 ok postfix/lmtp[3756]: smtp_stream_setup: maxtime=300 enable_deadline=0 postfix/lmtp[3756]: < 169.254.220.13[169.254.220.13]:24: 250 2.1.5 ok postfix/lmtp[3756]: smtp_stream_setup: maxtime=120 enable_deadline=0 postfix/lmtp[3756]: < 169.254.220.13[169.254.220.13]:24: 354 go ahead postfix/lmtp[3756]: smtp_stream_setup: maxtime=180 enable_deadline=0 postfix/lmtp[3756]: > 169.254.220.13[169.254.220.13]:24: . postfix/lmtp[3756]: > 169.254.220.13[169.254.220.13]:24: QUIT postfix/lmtp[3756]: smtp_stream_setup: maxtime=600 enable_deadline=0 cyrus/mupdate[3520]: cmd_find(fd:18, user.user1) cyrus/lmtp[3647]: USAGE user1 user: 0.004000 sys: 0.004000 cyrus/lmtp[3647]: connect(backend) failed: Connection refused cyrus/lmtp[3647]: telling master 1 cyrus/master[3461]: service lmtp pid 3647 in BUSY state: now available and in READY state cyrus/master[3461]: service lmtp now has 2 ready workers postfix/lmtp[3756]: < 169.254.220.13[169.254.220.13]:24: 451 4.4.3 Remote server unavailable postfix/lmtp[3756]: connect to subsystem private/defer postfix/lmtp[3756]: send attr nrequest = 0 postfix/lmtp[3756]: send attr flags = 0 postfix/lmtp[3756]: send attr queue_id = 706B36086B postfix/lmtp[3756]: send attr original_recipient = [email protected] postfix/lmtp[3756]: send attr recipient = [email protected] postfix/lmtp[3756]: send attr offset = 4294967295 postfix/lmtp[3756]: send attr dsn_orig_rcpt = rfc822;[email protected] cyrus/lmtp[3757]: executed postfix/lmtp[3756]: send attr notify_flags = 0 postfix/lmtp[3756]: send attr status = 4.4.3 postfix/lmtp[3756]: send attr diag_type = smtp postfix/lmtp[3756]: send attr diag_text = 451 4.4.3 Remote server unavailable postfix/lmtp[3756]: send attr mta_type = dns postfix/lmtp[3756]: send attr mta_mname = 169.254.220.13 postfix/lmtp[3756]: send attr action = delayed postfix/lmtp[3756]: send attr reason = host 169.254.220.13[169.254.220.13] said: 451 4.4.3 Remote server unavailable (in reply to end of DATA command)
转换OP评论到CW
现在我可以解决。 我告诉他们，如果有人发生同样的错误。
在/etc/cyrus.confreplace这一行
lmtp cmd="lmtpd" listen="backend:lmtp" prefork=1 maxchild=20 babysit=true maxforkrate=2 proto=tcp4 maxfds=256 -U 5 -T 10
同
lmtp cmd="lmtpproxyd" listen="lmtp" prefork=1 maxchild=20 maxforkrate=2 proto=tcp4 maxfds=256 -U 5 -T 10