我有一个问题与后缀。 当我试图从命令行发送一些邮件时，我得到：
Feb 14 12:44:35 some-server postfix/smtp[1022]: connect to gmail-smtp-in.l.google.com[2a00:1450:4010:c07::1a]:25: Network is unreachable Feb 14 12:45:05 some-server postfix/smtp[1022]: connect to gmail-smtp-in.l.google.com[64.233.164.27]:25: Connection timed out Feb 14 12:45:05 some-server postfix/smtp[1022]: connect to alt1.gmail-smtp-in.l.google.com[2404:6800:4008:c07::1a]:25: Network is unreachable Feb 14 12:45:35 some-server postfix/smtp[1022]: connect to alt1.gmail-smtp-in.l.google.com[64.233.189.27]:25: Connection timed out Feb 14 12:45:35 some-server postfix/smtp[1022]: connect to alt2.gmail-smtp-in.l.google.com[2404:6800:4008:c01::1b]:25: Network is unreachable Feb 14 12:45:35 some-server postfix/smtp[1022]: D23CB41F3B: to=<[email protected]>, relay=none, delay=60, delays=0.03/0/60/0, dsn=4.4.1, status=deferred (connect to alt2.gmail-smtp-in.l.google.com[2404:6800:4008:c01::1b]:25: Network is unreachable) 当我尝试telnet到smtp.gmail.com:25：
~$ telnet smtp.gmail.com 25 Trying 64.233.164.108...
它挂起。
任何想法，为什么它不工作？ 我应该检查什么？ 防火墙25端口（也是465/587）打开，main.cf config：
# See /usr/share/postfix/main.cf.dist for a commented, more complete version # Debian specific: Specifying a file name will cause the first # line of that file to be used as the name. The Debian default # is /etc/mailname. #myorigin = /etc/mailname smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no # appending .domain is the MUA's job. append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h readme_directory = no # TLS parameters smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key smtpd_use_tls=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for # information on enabling SSL in the smtp client. smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination myhostname = some-server.e24cloud.com alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = /etc/mailname mydestination = some-server.domain, some-server.e24cloud.com, localhost.e24cloud.com, localhost relayhost = mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all inet_protocols = all
编辑：
ifconfig和ufw设置：
eth0 Link encap:Ethernet HWaddr 52:54:00:9b:81:8a inet addr:12.34.56.78 Bcast:255.255.248.0 Mask:255.255.248.0 inet6 addr: fe80::5054:ff:fe9b:818a/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1460047 errors:0 dropped:0 overruns:0 frame:0 TX packets:1482450 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:224872395 (224.8 MB) TX bytes:5739336340 (5.7 GB) ufw status Status: active To Action From -- ------ ---- Apache ALLOW Anywhere 3306 ALLOW Anywhere 21/tcp ALLOW Anywhere 115/tcp ALLOW Anywhere 14956 ALLOW Anywhere 25/tcp ALLOW Anywhere 587 ALLOW Anywhere 12257/tcp ALLOW Anywhere 80/tcp ALLOW Anywhere 443 ALLOW Anywhere Apache Full ALLOW Anywhere Bind9 ALLOW Anywhere Apache Secure ALLOW Anywhere OpenSSH ALLOW Anywhere 1022/tcp ALLOW Anywhere 12257 ALLOW Anywhere 25 ALLOW Anywhere 22 ALLOW Anywhere 9418/tcp ALLOW Anywhere 21 (v6) ALLOW Anywhere (v6) Apache (v6) ALLOW Anywhere (v6) 3306 (v6) ALLOW Anywhere (v6) 21/tcp (v6) ALLOW Anywhere (v6) 115/tcp (v6) ALLOW Anywhere (v6) 14956 (v6) ALLOW Anywhere (v6) 25/tcp (v6) ALLOW Anywhere (v6) 587 (v6) ALLOW Anywhere (v6) 12257/tcp (v6) ALLOW Anywhere (v6) 80/tcp (v6) ALLOW Anywhere (v6) 443 (v6) ALLOW Anywhere (v6) Apache Full (v6) ALLOW Anywhere (v6) Bind9 (v6) ALLOW Anywhere (v6) Apache Secure (v6) ALLOW Anywhere (v6) OpenSSH (v6) ALLOW Anywhere (v6) 1022/tcp (v6) ALLOW Anywhere (v6) 12257 (v6) ALLOW Anywhere (v6) 25 (v6) ALLOW Anywhere (v6) 22 (v6) ALLOW Anywhere (v6) 9418/tcp (v6) ALLOW Anywhere (v6)