我已将我的邮件堆栈重新部署为 Kubernetes pod。此 pod 位于私有子网中的 EKS 集群上，位于 NLB 后面。Postfix 和 NLB 配置为使用代理协议 v2。
最初我在没有代理协议的情况下进行了此设置，并且 Postfix 端口按预期响应，在连接时立即发送 Postfix 横幅，但是 Postfix 无法正确识别向其发送邮件的远程服务器，并将所有内容标记为垃圾邮件。所以我决定走代理协议路线。
通过 telnet 连接时，连接打开，但 Postfix 不发送它的横幅。在发送 CRLF（按下回车键）之前不会发送横幅 - 您可以发送任何其他字符，并且在发送 CRLF 之前不会发生任何事情。这会影响 (587) 上的提交端口并中断客户端连接，因为 SMTP 协议声明接收服务器必须首先响应。
初始连接：
❯ telnet mx01.example.com 587
Trying x.x.x.x...
Connected to mx01.example.com.
Escape character is '^]'.
发送 CRLF 后：
❯ telnet mx01.example.com 587
Trying x.x.x.x...
Connected to mx01.example.com.
Escape character is '^]'.
220 mx01.example.com ESMTP Postfix (Ubuntu)
500 5.5.2 Error: bad syntax
这没有代理协议配置：
❯ telnet mx01.example.com 587
Trying x.x.x.x...
Connected to mx01.example.com.
Escape character is '^]'.
220 mx01.example.com ESMTP Postfix (Ubuntu)
版本：
操作系统：Ubuntu 20.10
后缀版本：3.5.6-1
后缀 master.cf
#
# Postfix master process configuration file. For details on the format
# of the file, see the master(5) manual page (command: "man 5 master" or
# on-line: http://www.postfix.org/master.5.html).
#
# Do not forget to execute "postfix reload" after editing this file.
#
# ==========================================================================
# service type private unpriv chroot wakeup maxproc command + args
# (yes) (yes) (no) (never) (100)
# ==========================================================================
smtp inet n - y - 1 postscreen
smtpd pass - - y - - smtpd
dnsblog unix - - y - 0 dnsblog
tlsproxy unix - - y - 0 tlsproxy
submission inet n - - - - smtpd
-o syslog_name=postfix/submission
-o smtpd_tls_security_level=encrypt
-o smtpd_client_restrictions=permit_sasl_authenticated,reject
-o cleanup_service_name=header_cleanup
-o smtpd_upstream_proxy_protocol=haproxy
#smtps inet n - y - - smtpd
# -o syslog_name=postfix/smtps
# -o smtpd_tls_wrappermode=yes
# -o smtpd_sasl_auth_enable=yes
# -o smtpd_reject_unlisted_recipient=no
# -o smtpd_client_restrictions=$mua_client_restrictions
# -o smtpd_helo_restrictions=$mua_helo_restrictions
# -o smtpd_sender_restrictions=$mua_sender_restrictions
# -o smtpd_recipient_restrictions=
# -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
# -o milter_macro_daemon_name=ORIGINATING
#628 inet n - y - - qmqpd
pickup unix n - y 60 1 pickup
cleanup unix n - y - 0 cleanup
header_cleanup unix n - - - 0 cleanup
-o header_checks=regexp:/etc/postfix/submission_header_cleanup.cf
qmgr unix n - n 300 1 qmgr
#qmgr unix n - n 300 1 oqmgr
tlsmgr unix - - y 1000? 1 tlsmgr
rewrite unix - - y - - trivial-rewrite
bounce unix - - y - 0 bounce
defer unix - - y - 0 bounce
trace unix - - y - 0 bounce
verify unix - - y - 1 verify
flush unix n - y 1000? 0 flush
proxymap unix - - n - - proxymap
proxywrite unix - - n - 1 proxymap
smtp unix - - y - - smtp
relay unix - - y - - smtp
-o syslog_name=postfix/$service_name
# -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
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
#
# ====================================================================
# Interfaces to non-Postfix software. Be sure to examine the manual
# pages of the non-Postfix software to find out what options it wants.
#
# Many of the following services use the Postfix pipe(8) delivery
# agent. See the pipe(8) man page for information about ${recipient}
# and other message envelope options.
# ====================================================================
#
# maildrop. See the Postfix MAILDROP_README file for details.
# Also specify in main.cf: maildrop_destination_recipient_limit=1
#
maildrop unix - n n - - pipe
flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient}
#
# ====================================================================
#
# See the Postfix UUCP_README file for configuration details.
#
uucp unix - n n - - pipe
flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
#
# Other external delivery methods.
#
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}
