问题如下：我们的服务器（CentOS 5，Postfix）无法接收邮件，但 bat 可以发送。
运行tcpdump port 25并从 Gmail 发送电子邮件显示有来自 Gmail 的传入请求
但是当我运行netstat -nltpil 时，显示没有进程在端口 25 上监听，以下是输出netstat -nltp：
tcp 0 0 0.0.0.0:993 0.0.0.0:* LISTEN 17434/couriertcpd
tcp 0 0 0.0.0.0:995 0.0.0.0:* LISTEN 17451/couriertcpd
tcp 0 0 127.0.0.1:10025 0.0.0.0:* LISTEN 28215/master
tcp 0 0 127.0.0.1:10026 0.0.0.0:* LISTEN 28215/master
tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN 6151/mysqld
tcp 0 0 0.0.0.0:106 0.0.0.0:* LISTEN 2147/xinetd
tcp 0 0 127.0.0.1:10027 0.0.0.0:* LISTEN 28215/master
tcp 0 0 0.0.0.0:110 0.0.0.0:* LISTEN 17442/couriertcpd
tcp 0 0 0.0.0.0:143 0.0.0.0:* LISTEN 17424/couriertcpd
tcp 0 0 0.0.0.0:8880 0.0.0.0:* LISTEN 32353/sw-cp-serverd
tcp 0 0 127.0.0.1:10001 0.0.0.0:* LISTEN 32353/sw-cp-serverd
tcp 0 0 **.***.**.***:53 0.0.0.0:* LISTEN 2292/named
tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN 2292/named
tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN 2147/xinetd
tcp 0 0 0.0.0.0:2006 0.0.0.0:* LISTEN 32353/sw-cp-serverd
tcp 0 0 127.0.0.1:5432 0.0.0.0:* LISTEN 2488/postmaster
tcp 0 0 127.0.0.1:953 0.0.0.0:* LISTEN 2292/named
tcp 0 0 0.0.0.0:8443 0.0.0.0:* LISTEN 32353/sw-cp-serverd
tcp 0 0 :::80 :::* LISTEN 18594/httpd
tcp 0 0 :::22 :::* LISTEN 2135/sshd
tcp 0 0 :::443 :::* LISTEN 18594/httpd
还有以下输出telnet 127.0.0.1 25：
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
我需要做一些端口转发吗？
编辑：这是 main.cf
queue_directory = /var/spool/postfix
daemon_directory = /usr/libexec/postfix
mail_owner = postfix
inet_interfaces = all
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
unknown_local_recipient_reject_code = 550
alias_maps = hash:/etc/aliases, hash:/var/spool/postfix/plesk/aliases
alias_database = hash:/etc/aliases
debug_peer_level = 2
debugger_command =
PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
xxgdb $daemon_directory/$process_name $process_id & sleep 5
sendmail_path = /usr/sbin/sendmail.postfix
newaliases_path = /usr/bin/newaliases.postfix
mailq_path = /usr/bin/mailq.postfix
setgid_group = postdrop
html_directory = no
manpage_directory = /usr/share/man
sample_directory = /usr/share/doc/postfix-2.3.3/samples
readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES
virtual_mailbox_domains = $virtual_mailbox_maps, hash:/var/spool/postfix/plesk/virtual_domains
virtual_alias_maps = $virtual_maps, hash:/var/spool/postfix/plesk/virtual
virtual_mailbox_maps = hash:/var/spool/postfix/plesk/vmailbox
transport_maps = hash:/var/spool/postfix/plesk/transport
smtpd_tls_cert_file = /etc/postfix/postfix_default.pem
smtpd_tls_key_file = $smtpd_tls_cert_file
smtpd_tls_security_level = may
smtpd_use_tls = yes
smtp_tls_security_level = may
smtp_use_tls = no
mynetworks = 127.0.0.0/8, **.***.**.***/31
smtpd_sender_restrictions = check_sender_access hash:/var/spool/postfix/plesk/blacklists, permit_sasl_authenticated, check_client_access pcre:/var/spool/postfix/plesk/non_auth.re
smtp_send_xforward_command = yes
smtpd_authorized_xforward_hosts = 127.0.0.0/8
smtpd_sasl_auth_enable = yes
smtpd_recipient_restrictions = permit_mynetworks, check_client_access pcre:/var/spool/postfix/plesk/no_relay.re, permit_sasl_authenticated, reject_unauth_destination
virtual_mailbox_base = /var/qmail/mailnames
virtual_uid_maps = static:110
virtual_gid_maps = static:31
virtual_transport = plesk_virtual
plesk_virtual_destination_recipient_limit = 1
smtpd_client_restrictions =
myhostname = *******.com
message_size_limit = 10240000
输出ps -ef |grep postfix：
root 28215 1 0 20:39 ? 00:00:00 /usr/libexec/postfix/master
postfix 28218 28215 0 20:39 ? 00:00:00 qmgr -l -t fifo -u
postfix 28239 28215 0 20:40 ? 00:00:00 tlsmgr -l -t unix -u
postfix 28240 28215 0 20:40 ? 00:00:00 spawn -n 127.0.0.1:10027 -t inet user=mhandlers-user argv=/usr/lib64/plesk-9.0/postfix-queue 127.0.0.1 10026 before-remote
postfix 28242 28215 0 20:40 ? 00:00:00 smtpd -n 127.0.0.1:10026 -t inet -u -c -o smtpd_client_restrictions -o smtpd_helo_restrictions -o smtpd_sender_restrictions -o smtpd_recipient_restrictions permit_mynetworks,reject -o smtpd_data_restrictions -o receive_override_options no_unknown_recipient_checks
postfix 28539 28215 0 20:57 ? 00:00:00 trivial-rewrite -n rewrite -t unix -u
postfix 29058 28215 0 21:27 ? 00:00:00 pickup -l -t fifo -u -c -o content_filter smtp:127.0.0.1:10027
postfix 29314 28215 0 21:41 ? 00:00:00 bounce -z -t unix -u
postfix 29338 28215 0 21:44 ? 00:00:00 cleanup -z -t unix -u
postfix 29358 28215 0 21:46 ? 00:00:00 smtp -t unix -u
postfix 29457 28215 0 21:56 ? 00:00:00 smtp -t unix -u
postfix 29716 28215 0 22:08 ? 00:00:00 bounce -z -t unix -u
root 29749 29571 0 22:10 pts/3 00:00:00 grep postfix
答案1
看起来您的 postfix master pid 正在监听端口 10025 和 10025。
查看 /etc/postfix/master.cf 中的 smtpd 守护进程。我的看起来像这样
smtp inet n - n - - smtpd
您的邮件中似乎没有“smtp”，而是 10025，还有一行是 10026。另一种（不太可能的）可能性是，您有smtp 10025/tcp在/etc/services。
更新你的 master.cf 使其看起来像给出的示例，然后
sudo service postfix restart
答案2
输出是什么：
sudo service postfix status
如果已停止，请运行：
sudo service postfix start
确保/etc/postfix/main.cf将 inet_interfaces 设置为全部或者您希望 Postfix 监听的特定接口。