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配置 Postfix 以在自己的服务器上使用邮件流量，但在配置的最后一步遇到了这些问题，下面就是所有这些 指示。
不幸的是我遇到了以下错误：
telnet YMDOMAIN.COM 993
Trying STATIC_IP
telnet: Unable to connect to remote host: Connection Refused
这里还有更多信息：
root@node01-ubuntu:~# telnet localhost 993
Trying ::1...
Trying 127.0.0.1...
telnet: Unable to connect to remote host: Connection refused
Netstat（在 993 上运行，无可用信息）
root@node01-ubuntu:~# netstat -lnp | grep 25
tcp6 0 0 :::80 :::* LISTEN 1253/apache2
tcp6 0 0 :::443 :::* LISTEN 1253/apache2
unix 2 [ ACC ] STREAM LISTENING 12585 1/init /run/snapd-snap.socket
unix 2 [ ACC ] STREAM LISTENING 12590 1/init /var/run/dbus/system_bus_socket
unix 2 [ ACC ] STREAM LISTENING 12591 1/init /run/acpid.socket
unix 2 [ ACC ] STREAM LISTENING 12595 1/init /run/uuidd/request
unix 2 [ ACC ] STREAM LISTENING 12592 1/init /var/lib/lxd/unix.socket
unix 2 [ ACC ] STREAM LISTENING 12584 1/init /run/snapd.socket
iptables 目录
root@node01-ubuntu:~# iptables -L --verbose
Chain INPUT (policy ACCEPT 251 packets, 61345 bytes)
pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 163 packets, 110K bytes)
pkts bytes target prot opt in out source destination
master.cf 列表
#
# 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 - - smtpd
#smtp inet n - y - 1 postscreen
#smtpd pass - - y - - smtpd
#dnsblog unix - - y - 0 dnsblog
#tlsproxy unix - - y - 0 tlsproxy
#submission inet n - y - - smtpd
# -o syslog_name=postfix/submission
# -o smtpd_tls_security_level=encrypt
# -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=$mua_sender_restrictions
# -o smtpd_recipient_restrictions=
# -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
# -o milter_macro_daemon_name=ORIGINATING
#smtps inet n - y - - smtpd
# -o syslog_name=postfix/smtps
# -o smtpd_tls_wrappermode=yes
# -o smtpd_sasl_auth_enable=yes
# -o smtpd_reject_unlisted_recipient=no
# -o smtpd_client_restrictions=$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
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 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
#
# ====================================================================
# 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}
#
# ====================================================================
#
# Recent Cyrus versions can use the existing "lmtp" master.cf entry.
#
# Specify in cyrus.conf:
# lmtp cmd="lmtpd -a" listen="localhost:lmtp" proto=tcp4
#
# Specify in main.cf one or more of the following:
# mailbox_transport = lmtp:inet:localhost
# virtual_transport = lmtp:inet:localhost
#
# ====================================================================
#
# Cyrus 2.1.5 (Amos Gouaux)
# Also specify in main.cf: cyrus_destination_recipient_limit=1
#
#cyrus unix - n n - - pipe
# user=cyrus argv=/cyrus/bin/deliver -e -r ${sender} -m ${extension} ${user}
#
# ====================================================================
# Old example of delivery via Cyrus.
#
#old-cyrus unix - n n - - pipe
# flags=R user=cyrus argv=/cyrus/bin/deliver -e -m ${extension} ${user}
#
# ====================================================================
#
# See the Postfix UUCP_README file for configuration details.
#
uucp unix - n n - - pipe
flags=Fqhu user=uucp argv=uux -r -n -z -a$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}
submission inet n - - - - smtpd
-o syslog_name=postfix/submission
-o smtpd_tls_security_level=encrypt
-o smtpd_sasl_auth_enable=yes
-o smtpd_client_restrictions=permit_sasl_authenticated,reject
答案1
PostFix 默认设置为监听端口 25 - 传统 SMTP。它在 TCP 端口 465 上有 SSL/TLS 加密等效项，在端口 567 上有 StartTLS 提交。端口 993 是不是PostFix 端口。
你也不需要使能够任何其他端口，我也没有确认您是否拥有其他端口的 SSL 证书。
它声音就像您正在寻找的不是 PostFix，而是 DoveCot - 用于处理 IMAP 方面的事情。
综上所述，我想你对端口是什么有点困惑。默认情况下，PostFix 设置为监听端口 25、标准 SMTP 端口，而不监听其他端口。
也就是说，这是常见的 SMTP/SMTPS/StartTLS SMTP 端口、IMAP 端口和 POP3 端口的细分，以及有关哪种软件应与每个端口配合使用的说明：
SMTP 端口（PostFix、Sendmail 等）
tcp / 25（SMTP）tcp / 465（短信服务）tcp / 567（与 StartTLS 一起提交）
IMAP 端口（DoveCot 或其他 IMAP 服务器）
tcp / 143（IMAP，但您可以在启用 StartTLS 的情况下运行它）tcp / 993（SSL/TLS 加密的 IMAP）
POP3 端口（DoveCot 或其他 POP3 服务器）
tcp / 110（POP3）tcp / 995（SSL/TLS 加密的 POP3）
你想要的是让 PostFix 监听一个端口不是启用 SMTP - 主要是因为它不是 SMTP 端口。