我们的服务器不仅不能向 yahoo 发送电子邮件，dkim、spf 工作正常，而且 ip 也从任何黑名单中清除。其他 yahoo 电子邮件工作得最好。我们的服务器可以向 gmail、windows mail、yandex 等发送电子邮件。
Postfix 邮件队列：
主机 mta5.am0.yahoodns.net[98.136.217.203] 说：421 4.7.0 [TSS09] 由于用户投诉，来自 107.xx.57.xxx 的所有邮件暂时推迟 - 4.16.56.1；请参阅 help.yahoo.com/kb/postmaster/SLN3326.html（回复 MAIL FROM 命令）
投递暂时中止：发送 RCPT TO 时与 mta5.am0.yahoodns.net[98.136.217.202] 失去连接
Postfix 邮件日志：
3 月 7 日 20:00:13 server-cloud752 postfix-yahoo/smtp[25003]: 104A165E7: 主机 mta5.am0.yahoodns.net[66.196.118.33] 说：421 4.7.0 [TSS09] 由于用户投诉，来自 107.175.57.166 的所有邮件暂时推迟 - 4.16.56.1；请参阅 help.yahoo.com/kb/postmaster/SLN3326.html（回复 MAIL FROM 命令）
3 月 7 日 20:00:13 serverwp21 postfix-yahoo/smtp[25003]: 104A165E7: 发送 RCPT TO 时与 mta5.am0.yahoodns.net[66.196.118.33] 失去连接
Postfix 主配置文件
#soft_bounce = no
# LOCAL PATHNAME INFORMATION
queue_directory = /var/spool/postfix
# The command_directory parameter specifies the location of all
# postXXX commands.
#
command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
mail_owner = postfix
#default_privs = nobody
# INTERNET HOST AND DOMAIN NAMES
#myhostname = host.domain.tld
#myhostname = virtual.domain.tld
#
#mydomain = domain.tld
# SENDING MAIL
#myorigin = $myhostname
#myorigin = $mydomain
# RECEIVING MAIL
#inet_interfaces = all
#inet_interfaces = $myhostname
#inet_interfaces = $myhostname, localhost
inet_interfaces = all
# Enable IPv4, and IPv6 if supported
inet_protocols = all
#
#proxy_interfaces =
#proxy_interfaces = 1.2.3.4
#
#
mydestination = $myhostname, localhost.$mydomain, localhost, serverwp21.jawanet.com
#mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
#mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain,
# mail.$mydomain, www.$mydomain, ftp.$mydomain
# REJECTING MAIL FOR UNKNOWN LOCAL USERS
#
# To turn off local recipient checking in the SMTP server, specify
# local_recipient_maps = (i.e. empty).
#
# local_recipient_maps setting if:
#
#
#
# - You redefine the local delivery agent in master.cf.
#
# - You redefine the "local_transport" setting in main.cf.
#
# - You use the "luser_relay", "mailbox_transport", or "fallback_transport"
# feature of the Postfix local delivery agent (see local(8)).
#
# Details are described in the LOCAL_RECIPIENT_README file.
#
# The right-hand side of the lookup tables is conveniently ignored.
# In the left-hand side, specify a bare username, an @domain.tld
# wild-card, or specify a [email protected] address.
#
#local_recipient_maps = unix:passwd.byname $alias_maps
#local_recipient_maps = proxy:unix:passwd.byname $alias_maps
#local_recipient_maps =
#
#
unknown_local_recipient_reject_code = 550
# TRUST AND RELAY CONTROL
# The mynetworks parameter specifies the list of "trusted" SMTP
# clients that have more privileges than "strangers".
#
#
#
#
#
#mynetworks_style = class
#mynetworks_style = subnet
#mynetworks_style = host
# (the value on the table right-hand side is not used).
#
#mynetworks = 168.100.189.0/28, 127.0.0.0/8
#mynetworks = $config_directory/mynetworks
#mynetworks = hash:/etc/postfix/network_table
#
#
# In addition to the above, the Postfix SMTP server by default accepts mail
# that Postfix is final destination for:
# - destinations that match $inet_interfaces or $proxy_interfaces,
# - destinations that match $mydestination
# - destinations that match $virtual_alias_domains,
# - destinations that match $virtual_mailbox_domains.
# These destinations do not need to be listed in $relay_domains.
#
# Specify a list of hosts or domains, /file/name patterns or type:name
# lookup tables, separated by commas and/or whitespace. Continue
# long lines by starting the next line with whitespace. A file name
# is replaced by its contents; a type:name table is matched when a
# (parent) domain appears as lookup key.
#
# NOTE: Postfix will not automatically forward mail for domains that
# list this system as their primary or backup MX host. See the
# permit_mx_backup restriction description in postconf(5).
#
#relay_domains = $mydestination
# INTERNET OR INTRANET
#
#
# If you're connected via UUCP, see also the default_transport parameter.
#
#relayhost = $mydomain
#relayhost = [gateway.my.domain]
#relayhost = [mailserver.isp.tld]
#relayhost = uucphost
#relayhost = [an.ip.add.ress]
# REJECTING UNKNOWN RELAY USERS
#
#
#
#relay_recipient_maps = hash:/etc/postfix/relay_recipients
# INPUT RATE CONTROL
#
#
#
# Specify 0 to disable the feature. Valid delays are 0..10.
#
#in_flow_delay = 1s
# ADDRESS REDIRECTION (VIRTUAL DOMAIN)
#
# The VIRTUAL_README document gives information about the many forms
# of domain hosting that Postfix supports.
# "USER HAS MOVED" BOUNCE MESSAGES
#
# See the discussion in the ADDRESS_REWRITING_README document.
# TRANSPORT MAP
#
# See the discussion in the ADDRESS_REWRITING_README document.
# ALIAS DATABASE
#
#
#
#
#alias_maps = dbm:/etc/aliases
alias_maps = hash:/etc/aliases
#alias_maps = hash:/etc/aliases, nis:mail.aliases
#alias_maps = netinfo:/aliases
#
#
#alias_database = dbm:/etc/aliases
#alias_database = dbm:/etc/mail/aliases
alias_database = hash:/etc/aliases
#alias_database = hash:/etc/aliases, hash:/opt/majordomo/aliases
# ADDRESS EXTENSIONS (e.g., user+foo)
#
#recipient_delimiter = +
# DELIVERY TO MAILBOX
#
# The home_mailbox parameter specifies the optional pathname of a
# mailbox file relative to a user's home directory. The default
# mailbox file is /var/spool/mail/user or /var/mail/user. Specify
# "Maildir/" for qmail-style delivery (the / is required).
#
#home_mailbox = Mailbox
#home_mailbox = Maildir/
# The mail_spool_directory parameter specifies the directory where
# UNIX-style mailboxes are kept. The default setting depends on the
# system type.
#
#mail_spool_directory = /var/mail
#mail_spool_directory = /var/spool/mail
#
#
#
#mailbox_command = /some/where/procmail
#mailbox_command = /some/where/procmail -a "$EXTENSION"
#
#
#
#
#
# Cyrus IMAP over LMTP. Specify ``lmtpunix cmd="lmtpd"
# listen="/var/imap/socket/lmtp" prefork=0'' in cyrus.conf.
#mailbox_transport = lmtp:unix:/var/lib/imap/socket/lmtp
# If using the cyrus-imapd IMAP server deliver local mail to the IMAP
# server using LMTP (Local Mail Transport Protocol), this is prefered
# over the older cyrus deliver program by setting the
# mailbox_transport as below:
#
# mailbox_transport = lmtp:unix:/var/lib/imap/socket/lmtp
#
# The efficiency of LMTP delivery for cyrus-imapd can be enhanced via
# these settings.
#
# local_destination_recipient_limit = 300
# local_destination_concurrency_limit = 5
#
# Cyrus IMAP via command line. Uncomment the "cyrus...pipe" and
# subsequent line in master.cf.
#mailbox_transport = cyrus
#.
#
#fallback_transport = lmtp:unix:/var/lib/imap/socket/lmtp
#fallback_transport =
#
# luser_relay works only for the default Postfix local delivery agent.
#
#luser_relay = [email protected]
#luser_relay = [email protected]
#luser_relay = admin+$local
# JUNK MAIL CONTROLS
#
# The controls listed here are only a very small subset. The file
# SMTPD_ACCESS_README provides an overview.
#
# For details, see "man header_checks".
#
#header_checks = regexp:/etc/postfix/header_checks
# FAST ETRN SERVICE
#
#
#fast_flush_domains = $relay_domains
# SHOW SOFTWARE VERSION OR NOT
#
#
#
#smtpd_banner = $myhostname ESMTP $mail_name
#smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)
# PARALLEL DELIVERY TO THE SAME DESTINATION
#
#
# Each message delivery transport has its XXX_destination_concurrency_limit
# parameter. The default is $default_destination_concurrency_limit for
# most delivery transports. For the local delivery agent the default is 2.
#local_destination_concurrency_limit = 2
#default_destination_concurrency_limit = 20
# DEBUGGING CONTROL
#
# The debug_peer_level parameter specifies the increment in verbose
# logging level when an SMTP client or server host name or address
# matches a pattern in the debug_peer_list parameter.
#
debug_peer_level = 2
#
#debug_peer_list = 127.0.0.1
#debug_peer_list = some.domain
# The debugger_command specifies the external command that is executed
# when a Postfix daemon program is run with the -D option.
#
# Use "command .. & sleep 5" so that the debugger can attach before
# the process marches on. If you use an X-based debugger, be sure to
# set up your XAUTHORITY environment variable before starting Postfix.
#
debugger_command =
PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
ddd $daemon_directory/$process_name $process_id & sleep 5
# If you can't use X, use this to capture the call stack when a
# daemon crashes. The result is in a file in the configuration
# directory, and is named after the process name and the process ID.
#
# debugger_command =
# PATH=/bin:/usr/bin:/usr/local/bin; export PATH; (echo cont;
# echo where) | gdb $daemon_directory/$process_name $process_id 2>&1
# >$config_directory/$process_name.$process_id.log & sleep 5
#
#
# debugger_command =
# PATH=/bin:/usr/bin:/sbin:/usr/sbin; export PATH; screen
# -dmS $process_name gdb $daemon_directory/$process_name
# $process_id & sleep 1
# INSTALL-TIME CONFIGURATION INFORMATION
#
# The following parameters are used when installing a new Postfix version.
#
#
sendmail_path = /usr/sbin/sendmail.postfix
# newaliases_path: The full pathname of the Postfix newaliases command.
# This is the Sendmail-compatible command to build alias databases.
#
newaliases_path = /usr/bin/newaliases.postfix
# mailq_path: The full pathname of the Postfix mailq command. This
# is the Sendmail-compatible mail queue listing command.
#
mailq_path = /usr/bin/mailq.postfix
#
setgid_group = postdrop
# html_directory: The location of the Postfix HTML documentation.
#
html_directory = no
# manpage_directory: The location of the Postfix on-line manual pages.
#
manpage_directory = /usr/share/man
# sample_directory: The location of the Postfix sample configuration files.
# This parameter is obsolete as of Postfix 2.1.
#
sample_directory = /usr/share/doc/postfix-2.10.1/samples
# readme_directory: The location of the Postfix README files.
#
readme_directory = /usr/share/doc/postfix-2.10.1/README_FILES
transport_maps = hash:/etc/postfix/transport, regexp:/etc/postfix/transport.regexp
yahoo_initial_destination_concurrency = 1
yahoo_destination_concurrency_limit = 4
yahoo_destination_recipient_limit = 2
yahoo_destination_rate_delay = 1s
virtual_alias_maps = hash:/etc/postfix/virtual
sender_bcc_maps = hash:/etc/postfix/bcc
mailbox_command = /usr/bin/procmail-wrapper -o -a $DOMAIN -d $LOGNAME
home_mailbox = Maildir/
smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated permit_inet_interfaces check_policy_service unix:/var/spool/postfix/postgrey/socket permit_mx_backup
mailbox_size_limit = 0
sender_dependent_default_transport_maps = hash:/etc/postfix/dependent
smtp_use_tls = yes
milter_default_action = accept
milter_protocol = 2
smtpd_milters = inet:localhost:8891
non_smtpd_milters = inet:localhost:8891
sender_canonical_maps = hash:/etc/postfix/canonical
allow_untrusted_routing = yes
smtpd_tls_cert_file = /etc/sslku/ssl.cert
smtpd_tls_key_file = /etc/sslku/ssl.key
smtpd_tls_CAfile = /etc/sslku/ssl.ca
smtpd_use_tls = yes
smtpd_tls_mandatory_protocols = SSLv3, TLSv1
smtpd_tls_mandatory_ciphers = high
我尝试了 google 上的各种 postfix 教程并联系了 yahoo 支持，看到了这里的问题，但都无济于事。
使用的软件
- Virtualmin +webmin
- Postfix + Dovecot 邮件服务器
- Centos 7.3
- Whmcs 计费系统
请分享任何想法。
答案1
根据您提供的日志，Yahoo 认为您的 IP 显示“异常活动”。
这知识库文章他们在回复中向你提供了（一点点）更多信息：
使用共享 IP 地址 - 来自其他域的邮件流量可能会对您的 IP 发送声誉产生负面影响。请联系您的主机提供商，请求使用专用 IP 地址发送邮件以解决此问题。
监控您的发件人信誉 - 即使您的信誉良好，用户也可能将您的电子邮件评为垃圾邮件，从而影响您的整体信誉。我们会审查提交的投递问题 IP，并根据审查结果，在必要时修改您系统中的信誉。
正如@所提到的亚伦，您的 IP 也出现在一些黑名单中，因此我倾向于怀疑您将很难让他们撤销决定。不幸的是，除了联系他们并要求他们撤销封锁之外，我不确定您能做多少事情。
但是，如果您确实觉得自己被错误地列入了 RBL，您可以联系您列出的 RBL 维护人员，并要求他们审核您是否被列入他们的黑名单。
更新：
在检查的 95 个黑名单中，我只能在一个黑名单上找到源 IP：https://mxtoolbox.com/SuperTool.aspx?action=blacklist%3a107.175.57.166&run=toolpage
Aaron 的列表确实显示了更多条目，但是最常用的 RBL 中没有任何条目。
我认为这表明该问题可能完全由问题中显示的错误信息所概括deferred due to user complaints。
我认为这意味着最好的办法是向雅虎报告该问题，并询问他们是什么原因导致他们将服务器/IP 归类为显示“异常活动”。