Email
為什麼我不能發送郵件到遠端郵箱？
我已經在我的 CentOS 機器上安裝了 Postfix。我可以很好地將郵件發送到本地帳戶
mutt，但是當我嘗試將一封郵件發送到 myactualmail@gmail.com 之類的遠端郵件時，我不明白為什麼我收不到任何東西。這是我的main.cf：queue_directory = /var/spool/postfix command_directory = /usr/sbin daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix mail_owner = postfix myhostname = server.example.com mydomain = example.com myorigin = $mydomain inet_interfaces = all inet_protocols = all mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain unknown_local_recipient_reject_code = 550 mynetworks = 192.168.200.0/24, 127.0.0.0/8 alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases 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 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-2.6.6/samples readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES在郵件日誌中，我找到了這些：
Jan 22 14:33:15 server postfix/qmgr[5025]: 316FEBF65E: from=<diego@example.com>, size=430, nrcpt=1 (queue active) Jan 22 14:33:15 server postfix/smtp[5276]: connect to gmail-smtp-in.l.google.com[2a00:1450:400c:c05::1b]:25: Network is unreachable Jan 22 14:33:15 server postfix/smtp[5276]: connect to gmail-smtp-in.l.google.com[173.194.66.26]:25: Connection refused Jan 22 14:33:15 server postfix/smtp[5276]: connect to alt1.gmail-smtp-in.l.google.com[2a00:1450:400c:c05::1a]:25: Network is unreachable Jan 22 14:33:15 server postfix/smtp[5276]: connect to alt1.gmail-smtp-in.l.google.com[173.194.70.26]:25: Connection refused Jan 22 14:33:15 server postfix/smtp[5276]: connect to alt2.gmail-smtp-in.l.google.com[2a00:1450:400c:c05::1b]:25: Network is unreachable Jan 22 14:33:15 server postfix/smtp[5276]: 316FEBF65E: to=<myactualmail@gmail.com>, relay=none, delay=2662, delays=2661/0.04/0.08/0, dsn=4.4.1, status=deferred (connect to alt2.gmail-smtp-in.l.google.com[2a00:1450:400c:c05::1b]:25: Network is unreachable)但我可以很好地 ping 主機：
ping gmail-smtp-in.l.google.com PING gmail-smtp-in.l.google.com (173.194.66.26) 56(84) bytes of data. 64 bytes from we-in-f26.1e100.net (173.194.66.26): icmp_seq=1 ttl=128 time=29.2 ms 64 bytes from we-in-f26.1e100.net (173.194.66.26): icmp_seq=2 ttl=128 time=29.6 ms 64 bytes from we-in-f26.1e100.net (173.194.66.26): icmp_seq=3 ttl=128 time=31.0 ms
如果出現配置似乎正常的 SMTP 問題，首先要做的是您實際上可以訪問 SMTP 伺服器。
採用：
telnet gmail-smtp-in.l.google.com 25你應該看到：
Trying 173.194.69.27... Connected to gmail-smtp-in.l.google.com. Escape character is '^]'. 220 mx.google.com ESMTP lv5si9142984bkb.114 - gsmtp（在該類型 QUIT
Enter退出之後）如果沒有顯示您的防火牆（或更可能是您的提供商之一）可能會阻止您。如果可能，請從另一個位置嘗試此操作，以仔細檢查機器是否響應（在您的情況下gmail-smtp-in.l.google.com是響應）。如果提供商是原因，您可能需要使用其 STMP 伺服器（他們試圖以這種方式防止垃圾郵件從您的系統中流出）。