我正在尝试通过 Outlook 连接到 Postfix 服务器（通过 smtp 发送示例消息）。在服务器上，端口似乎已打开：
nmap -sT -O localhost
Starting Nmap 6.40 ( http://nmap.org ) at 2016-09-24 15:23 EDT
Nmap scan report for localhost (127.0.0.1)
Host is up (0.000046s latency).
Other addresses for localhost (not scanned): 127.0.0.1
rDNS record for 127.0.0.1: localhost.localdomain
Not shown: 990 closed ports
PORT STATE SERVICE
21/tcp open ftp
22/tcp open ssh
25/tcp open smtp
80/tcp open http
110/tcp open pop3
143/tcp open imap
993/tcp open imaps
995/tcp open pop3s
3306/tcp open mysql
10000/tcp open snet-sensor-mgmt
No exact OS matches for host (If you know what OS is running on it, see http://nmap.org/submit/ ).
Network Distance: 0 hops
OS detection performed. Please report any incorrect results at http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 12.06 seconds
但当我尝试通过 Outlook 连接到服务器时，它似乎根本没有响应。这是我进行的 telnet 检查（hostname9727.com 在我的主机文件中定义）：
C:\Users\A>telnet hostname9727.com 25
Connecting To hostname9727.com...Could not open connection to the host, on port 25: Connect failed
而对于其他端口如 110：
+OK Dovecot ready.
已创建连接
后配置-n
后配置-n
alias_database = hash:/etc/aliases home_mailbox = /home/virtual/mail/
alias_maps = hash:/etc/aliases
broken_sasl_auth_clients = yes
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5
home_mailbox = /home/virtual/mail/
html_directory = no
inet_interfaces = localhost
inet_protocols = all
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
mydomain = hostname9727.com
mynetworks = 127.0.0.0/8, 10.0.0.0/24
myorigin = $myhostname
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.10.1/README_FILES
sample_directory = /usr/share/doc/postfix-2.10.1/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtpd_banner = $myhostname ESMTP
unknown_local_recipient_reject_code = 550
后配置-M
smtp inet n - n - - smtpd
pickup unix n - n 60 1 pickup
cleanup unix n - n - 0 cleanup
qmgr unix n - n 300 1 qmgr
tlsmgr unix - - n 1000? 1 tlsmgr
rewrite unix - - n - - trivial-rewrite
bounce unix - - n - 0 bounce
defer unix - - n - 0 bounce
trace unix - - n - 0 bounce
verify unix - - n - 1 verify
flush unix n - n 1000? 0 flush
proxymap unix - - n - - proxymap
proxywrite unix - - n - 1 proxymap
smtp unix - - n - - smtp
relay unix - - n - - smtp
showq unix n - n - - showq
error unix - - n - - error
retry unix - - n - - error
discard unix - - n - - discard
local unix - n n - - local
virtual unix - n n - - virtual
lmtp unix - - n - - lmtp
anvil unix - - n - 1 anvil
scache unix - - n - 1 scache
答案1
您的postfix服务器配置为仅可通过环回接口访问，如输出postconf行所示：
inet_interfaces = localhost
如果您希望它可以从其他主机访问，您需要通过输入以下命令来更改该配置：
sudo postconf -e "inet_interfaces = all"