我的邮件队列中有 4000 封等待发送给雅虎的电子邮件，全部如下所示：
(delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.136.96.91] while sending RCPT TO)
[email protected]
D0C9B29E4F 15392 Sun Dec 15 19:31:15 [email protected]
(delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.136.96.77] while sending RCPT TO)
[email protected]
D326520AA2 15301 Sun Dec 15 10:18:40 [email protected]
(delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.136.96.91] while sending RCPT TO)
[email protected]
DD42221113 15303 Thu Dec 12 20:57:13 [email protected]
(delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.136.96.91] while sending RCPT TO)
[email protected]
DBED020BBA 14573 Wed Dec 11 09:05:49 [email protected]
(delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.136.96.91] while sending RCPT TO)
[email protected]
DB3A920F65 15389 Sat Dec 14 11:04:58 [email protected]
(delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.136.96.91] while sending RCPT TO)
[email protected]
DA9B620C72 15039 Thu Dec 12 19:07:21 [email protected]
(delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.136.96.77] while sending RCPT TO)
[email protected]
D329020571 15542 Wed Dec 11 12:57:40 [email protected]
(delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.136.96.91] while sending RCPT TO)
[email protected]
DC5A229CBC 15526 Sat Dec 14 15:08:39 [email protected]
(delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.136.96.91] while sending RCPT TO)
[email protected]
受影响的 IP：mail.arsacia.ir (89.42.211.41)（专用 IP 地址）（不在任何黑名单中）
当我向 Yahoo 发送电子邮件时，登录我的 Postfix 邮件服务器：
Dec 16 05:06:32 server postfix/submission/smtpd[3459]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Dec 16 05:06:32 server postfix/submission/smtpd[3459]: connect from server.arsacia.ir[89.42.211.41]
Dec 16 05:06:32 server postfix/submission/smtpd[3459]: 90C4C2067B: client=server.arsacia.ir[89.42.211.41], sasl_method=LOGIN, sasl_username=root
Dec 16 05:06:32 server postfix/cleanup[3462]: 90C4C2067B: message-id=<[email protected]>
Dec 16 05:06:32 server postfix/qmgr[3405]: 90C4C2067B: from=<[email protected]>, size=8530, nrcpt=1 (queue active)
Dec 16 05:06:32 server postfix/submission/smtpd[3459]: disconnect from server.arsacia.ir[89.42.211.41]
Dec 16 05:06:34 server postfix/smtp[3463]: 90C4C2067B: host mta5.am0.yahoodns.net[98.136.96.91] said: 421 4.7.0 [TSS04] Messages from 89.42.211.41 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html (in reply to MAIL FROM command)
Dec 16 05:06:34 server postfix/smtp[3463]: 90C4C2067B: lost connection with mta5.am0.yahoodns.net[98.136.96.91] while sending RCPT TO
Dec 16 05:06:37 server postfix/smtp[3463]: 90C4C2067B: to=<[email protected]>, relay=mta5.am0.yahoodns.net[67.195.228.106]:25, delay=4.7, delays=0.1/0.02/4.3/0.29, dsn=4.7.0, status=deferred (host mta5.am0.yahoodns.net[67.195.228.106] said: 421 4.7.0 [TSS04] Messages from 89.42.211.41 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html (in reply to MAIL FROM command))
此错误绝不是暂时的！我遇到这个问题已经很久了，只是 Yahoo 有问题，这是我的邮件服务器向 Gmail 发送电子邮件时的日志示例：
Dec 16 05:10:16 server postfix/submission/smtpd[3476]: connect from server.arsacia.ir[89.42.211.41]
Dec 16 05:10:16 server postfix/submission/smtpd[3476]: 4242420AAA: client=server.arsacia.ir[89.42.211.41], sasl_method=LOGIN, sasl_username=root
Dec 16 05:10:16 server postfix/cleanup[3483]: 4242420AAA: message-id=<[email protected]>
Dec 16 05:10:16 server postfix/qmgr[3405]: 4242420AAA: from=<[email protected]>, size=8516, nrcpt=1 (queue active)
Dec 16 05:10:16 server postfix/submission/smtpd[3476]: disconnect from server.arsacia.ir[89.42.211.41]
Dec 16 05:10:18 server postfix/smtp[3484]: 4242420AAA: to=<[email protected]>, relay=gmail-smtp-in.l.google.com[64.233.167.26]:25, delay=2.2, delays=0.1/0.02/1.3/0.77, dsn=2.0.0, status=sent (250 2.0.0 OK 1576473018 h189si14621274wmh.31 - gsmtp)
Dec 16 05:10:18 server postfix/qmgr[3405]: 4242420AAA: removed
这是我向 Outlook 发送电子邮件时的日志：
Dec 16 05:27:11 server postfix/submission/smtpd[3524]: warning: dict_nis_init: NIS domain name not set - NIS lookups disabled
Dec 16 05:27:11 server postfix/submission/smtpd[3524]: connect from server.arsacia.ir[89.42.211.41]
Dec 16 05:27:11 server postfix/submission/smtpd[3524]: 8F6C020AAA: client=server.arsacia.ir[89.42.211.41], sasl_method=LOGIN, sasl_username=root
Dec 16 05:27:11 server postfix/cleanup[3528]: 8F6C020AAA: message-id=<[email protected]>
Dec 16 05:27:11 server postfix/qmgr[3405]: 8F6C020AAA: from=<[email protected]>, size=8506, nrcpt=1 (queue active)
Dec 16 05:27:11 server postfix/submission/smtpd[3524]: disconnect from server.arsacia.ir[89.42.211.41]
Dec 16 05:27:16 server postfix/smtp[3529]: 8F6C020AAA: to=<[email protected]>, relay=outlook-com.olc.protection.outlook.com[104.47.66.33]:25, delay=4.6, delays=0.09/0.02/2.1/2.3, dsn=2.6.0, status=sent (250 2.6.0 <[email protected]> [InternalId=12309376296217, Hostname=MW2NAM12HT052.eop-nam12.prod.protection.outlook.com] 16145 bytes in 0.327, 48.135 KB/sec Queued mail for delivery -> 250 2.1.5)
Dec 16 05:27:16 server postfix/qmgr[3405]: 8F6C020AAA: removed
所有其他电子邮件服务都可以接收我的电子邮件，只有雅虎除外。
我的 postfix 配置：
alias_database = hash:/etc/aliases
append_dot_mydomain = no
biff = no
broken_sasl_auth_clients = yes
config_directory = /etc/postfix
inet_interfaces = all
inet_protocols = ipv4
mailbox_size_limit = 0
milter_default_action = accept
milter_protocol = 2
mydestination = $myhostname localhost.$mydomain $mydomain
myhostname = server.arsacia.ir
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
myorigin = $mydomain
non_smtpd_milters = inet:localhost:1230
readme_directory = no
recipient_delimiter = +
relayhost =
smtp_enforce_tls = yes
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
smtp_tls_security_level = may
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
smtpd_milters = inet:localhost:12301
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_path = private/auth
smtpd_sasl_security_options = noanonymous, noplaintext
smtpd_sasl_tls_security_options = noanonymous
smtpd_sasl_type = dovecot
smtpd_tls_auth_only = yes
smtpd_tls_cert_file = /etc/letsencrypt/live/arsacia.ir-0003/fullchain.pem
smtpd_tls_key_file = /etc/letsencrypt/live/arsacia.ir-0003/privkey.pem
smtpd_tls_security_level = may
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_use_tls = yes
virtual_alias_maps = hash:/etc/postfix/virtual
以下是雅虎的回答：
他们根本不在乎。我已经注册了雅虎投诉反馈系统，没有收到任何投诉。
我还检查了 mxtoolbox.com，完全没有报告任何问题，所有检查都通过了。我的 DKIM、DMARC 和 SPF 都“通过”了。电子邮件使用正确的 SSL 加密。
有人知道如何解决这个问题吗？这对我和我的用户来说真的很烦人，他们必须等待 24 小时才能从我的电子邮件服务器收到电子邮件。
答案1
您需要在 Postfix 上为所有 Yahoo 域配置传出速率限制，因为 Yahoo 显然不喜欢您的速度/并发级别，并且您的 MTA 总是因此触发某种类型的反垃圾邮件防御机制。
看一下作者遇到同样问题的博客文章，它可能会有所帮助：
您可以在此处找到更简单的描述：https://wiki.deimos.fr/Postfix:_limit_outgoing_mail_throttling.html#Limit_by_domain
如果速率限制不能按预期发挥作用，您还有另外两个选择：要么完全放弃向雅虎发送电子邮件，要么使用在雅虎中享有良好信誉的商业邮件传递提供商来完成该任务。