我正在尝试找出这个配置出了什么问题。我收到了很多邮件/var/spool/postfix/maildrop（大约 30k 封！），但这些邮件就是发不出去。日志中没有错误。
如果我尝试重新排队 maildrop 中的其中一条消息，postsuper -r XXXXXXXXX则会默默失败。
我注意到，如果我使用 sendmail（通过 ssh 连接）直接从服务器发送电子邮件，邮件就会进入队列，而如果我通过客户端（例如 thunderbird）发送邮件，邮件就会立即送达（显然使用相同的 smtp 服务器；spf 和 dkim 得到正确应用）
maildrop 中的所有“死邮件”都不会出现在 qshape 中：
qshape active deferred
T 5 10 20 40 80 160 320 640 1280 1280+
TOTAL 11 0 0 0 0 0 0 0 0 0 11
example1.it 9 0 0 0 0 0 0 0 0 0 9
example2.com 1 0 0 0 0 0 0 0 0 0 1
example3.com 1 0 0 0 0 0 0 0 0 0 1
如果我发出一个通用消息，postsuper -r ALL我会得到少于 100 条的重新排队消息。
有什么建议吗？我的配置：
主配置文件
smtpd_tls_cert_file = /etc/ssl/certs/ssl-mail.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-mail.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 = example.com
mydestination = example.com
home_mailbox = Maildir/
mailbox_size_limit = 0
myorigin = /etc/mailname
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
smtpd_banner = $myhostname ESMTP $mail_name (Example.com)
append_dot_mydomain = no
readme_directory = no
biff = no
inet_interfaces = all
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
recipient_delimiter = +
relayhost =
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
smtpd_recipient_restrictions = reject_unknown_sender_domain, reject_unknown_recipient_domain, reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, check_policy_service unix:private/policy-spf
smtpd_sender_restrictions = reject_unknown_sender_domain
# Postfix ≥ 2.6 milter_protocol = 6, Postfix ≤ 2.5 milter_protocol = 2
milter_default_action = accept
milter_protocol = 6
smtpd_milters = inet:localhost:8891
non_smtpd_milters = inet:localhost:8891
smtpd_sasl_auth_enable = yes
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/dovecot-auth
smtpd_sasl_authenticated_header = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $myhostname
broken_sasl_auth_clients = yes
mailbox_command = /usr/lib/dovecot/deliver -c /etc/dovecot/conf.d/01-mail-stack-delivery.conf -m "${EXTENSION}"
smtp_use_tls = yes
smtpd_tls_received_header = yes
smtpd_tls_mandatory_protocols = SSLv3, TLSv1
smtpd_tls_mandatory_ciphers = medium
tls_random_source = dev:/dev/urandom
inet_protocols = ipv4
in_flow_delay = 0s
max_use = 500
destination_concurrency_feedback_debug = yes
smtp_host_lookup = dns,native
qmgr_message_active_limit = 50000
qmgr_message_recipient_limit = 50000
transport_maps = hash:/etc/postfix/transport
# tuning
default_destination_concurrency_failed_cohort_limit = 5
smtpd_tls_auth_only = yes
smtp_dns_support_level = enabled
default_process_limit = 100
fast_destination_concurrency_negative_feedback = 0
fast_destination_recipient_limit = 500
fast_minimum_delivery_slots = 1
fast_delivery_slot_cost = 25
fast_delivery_slot_discount = 5
fast_delivery_slot_loan = 1
fast_recipient_refill_limit = 20000
fast_destination_concurrency_failed_cohort_limit = 10
fast_initial_destination_concurrency = 40
fast_destination_concurrency_limit = 150
fast_destination_rate_delay = 0
semifast_initial_destination_concurrency = 20
semifast_destination_concurrency_limit = 60
semifast_destination_rate_delay = 2
medium_initial_destination_concurrency = 10
medium_destination_concurrency_limit = 40
medium_destination_rate_delay = 2
slow_initial_destination_concurrency = 5
slow_destination_concurrency_limit = 10
slow_destination_rate_delay = 2
主配置文件
#
# Postfix master process configuration file. For details on the format
# of the file, see the master(5) manual page (command: "man 5 master").
#
# Do not forget to execute "postfix reload" after editing this file.
#
# ==========================================================================
# service type private unpriv chroot wakeup maxproc command + args
# (yes) (yes) (yes) (never) (100)
# ==========================================================================
smtp inet n - n - 800 smtpd -v
pickup fifo n - - 10 1 pickup
cleanup unix n - - - 0 cleanup
qmgr fifo n - n 10 1 qmgr -v
#qmgr fifo n - n 300 1 oqmgr
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 - - n - 1200 smtp -v
relay unix - - - - 1200 smtp -v
showq unix n - - - - showq
error unix - - - - - error
retry unix - - - - - error
discard unix - - - - - discard
local unix - n n - - local
virtual unix - n n - - virtual
lmtp unix - - - - - lmtp
anvil unix - - - - 1 anvil
scache unix - - - - 1 scache
# alla fine la smetto coi milter e vado di classici per postfix
policy-spf unix - n n - - spawn user=nobody argv=/usr/sbin/postfix-policyd-spf-perl
maildrop unix - n n - - pipe flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient}
uucp unix - n n - - pipe
flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
ifmail unix - n n - - pipe
flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
# bsmtp unix - n n - - pipe
# flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient
#scalemail-backend unix - n n - 2 pipe
# flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}
#mailman unix - n n - - pipe
# flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
# ${nexthop} ${user}
fast unix - - - - 400 smtp
slow unix - - - - - smtp
medium unix - - - - - smtp
semifast unix - - - - - smtp