问题描述
我已经在 Ubuntu 20.04 服务器中配置了 Postfix + OpenDkim，但遇到了问题。 Postfix 不签署电子邮件，静默工作，不记录错误。
后缀
main.cf
smtpd_banner = central.mydomain.com ESMTP $mail_name (Ubuntu)
biff = no
append_dot_mydomain = no
readme_directory = /usr/share/doc/postfix
compatibility_level = 2
smtpd_tls_cert_file = /etc/letsencrypt/live/mydomain.com/fullchain.pem
smtpd_tls_key_file = /etc/letsencrypt/live/mydomain.com/privkey.pem
smtpd_tls_security_level=may
smtp_tls_CApath=/etc/ssl/certs
smtp_tls_security_level=may
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = central.mydomain.com
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = localhost
relayhost =
mynetworks = 127.0.0.0/8
mailBox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = ipv4
home_mailBox = Maildir/
virtual_alias_maps = proxy:MysqL:/etc/postfix/sql/MysqL_virtual_alias_maps.cf,proxy:MysqL:/etc/postfix/sql/MysqL_virtual_alias_domain_maps.cf,proxy:MysqL:/etc/postfix/sql/MysqL_virtual_alias_domain_catchall_maps.cf
html_directory = /usr/share/doc/postfix/html
virtual_mailBox_domains = proxy:MysqL:/etc/postfix/sql/MysqL_virtual_domains_maps.cf
virtual_mailBox_maps = proxy:MysqL:/etc/postfix/sql/MysqL_virtual_mailBox_maps.cf,proxy:MysqL:/etc/postfix/sql/MysqL_virtual_alias_domain_mailBox_maps.cf
smtpd_use_tls = yes
smtpd_tls_auth_only = yes
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes
virtual_transport = lmtp:unix:private/dovecot-lmtp
policyd-spf_time_limit = 3600
smtpd_recipient_restrictions = permit_mynetworks,permit_sasl_authenticated,reject_unauth_destination,check_policy_service unix:private/policyd-spf
milter_default_action = accept
milter_protocol = 6
smtpd_milters = local:opendkim/opendkim.sock
non_smtpd_milters = $smtpd_milters
master.cf
smtp inet n - y - - smtpd
-o syslog_name=postfix/submission
-o smtpd_tls_security_level=encrypt
-o smtpd_sasl_auth_enable=yes
-o smtpd_relay_restrictions=permit_sasl_authenticated,reject
-o milter_macro_daemon_name=ORIGINATING
smtps inet n - y - - smtpd
-o syslog_name=postfix/smtps
-o smtpd_sasl_auth_enable=yes
-o smtpd_relay_restrictions=permit_sasl_authenticated,reject
-o milter_macro_daemon_name=ORIGINATING
pickup unix n - y 60 1 pickup
cleanup unix n - y - 0 cleanup
qmgr unix n - n 300 1 qmgr
tlsmgr unix - - y 1000? 1 tlsmgr
rewrite unix - - y - - trivial-rewrite
bounce unix - - y - 0 bounce
defer unix - - y - 0 bounce
trace unix - - y - 0 bounce
verify unix - - y - 1 verify
flush unix n - y 1000? 0 flush
proxymap unix - - n - - proxymap
proxywrite unix - - n - 1 proxymap
smtp unix - - y - - smtp
relay unix - - y - - smtp
-o syslog_name=postfix/$service_name
showq unix n - y - - showq
error unix - - y - - error
retry unix - - y - - error
discard unix - - y - - discard
local unix - n n - - local
virtual unix - n n - - virtual
lmtp unix - - y - - lmtp
anvil unix - - y - 1 anvil
scache unix - - y - 1 scache
postlog unix-dgram n - n - 1 postlogd
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}
policyd-spf unix - n n - 0 spawn
user=policyd-spf argv=/usr/bin/policyd-spf
DKIM
/etc/opendkim.conf
Syslog yes
UMask 007
Canonicalization relaxed/simple
Mode sv
SubDomains no
AutoRestart yes
AutoRestartRate 10/1M
Background yes
DNSTimeout 5
SignatureAlgorithm rsa-sha256
Socket local:/var/spool/postfix/opendkim/opendkim.sock
PidFile /run/opendkim/opendkim.pid
OversignHeaders From
TrustAnchorFile /usr/share/dns/root.key
UserID opendkim
KeyTable refile:/etc/opendkim/key.table
SigningTable refile:/etc/opendkim/signing.table
ExternalIgnoreList /etc/opendkim/trusted.hosts
InternalHosts /etc/opendkim/trusted.hosts
密钥在 /etc/opendkim/keys/mydomain.com 上由 opendkim 拥有：opendkim 和 chmod 正确。
/etc/opendkim/signing.table
*@mydomain.com default._domainkey.mydomain.com
/etc/opendkim/key.table
default._domainkey.mydomain.com mydomain.com:default:/etc/opendkim/keys/mydomain.com/default.private
/etc/opendkim/trusted.hosts
127.0.0.1
176.xxx.xxx.xxx
localhost
*.mydomain.com
检查
opendkim-testkey -d mydomain.com -s default -vvv
opendkim-testkey: using default configfile /etc/opendkim.conf
opendkim-testkey: checking key 'default._domainkey.mydomain.com'
opendkim-testkey: key not secure
opendkim-testkey: key OK
重新启动两个守护进程但不起作用，并且在消息或 mail.log 上没有显示任何错误。
解决方法
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