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我试图安装在gcloud例如多域服务器，下面这个教程https://vorkbaard.nl/installing-a-mailserver-on-debian-8-part-3-mta-postfix/，我修改/etc/postfix/master.cf：如何在gcloud上设置postfix？
smtp inet n - y - - smtpd
到
597 inet n - y - - smtpd
当我telnet域597我成功地建立了连接，但试图从mailx或从telnet客户端发送电子邮件我收到错误，好像后缀仍然使用25端口：
Aug 24 19:26:08 localhost postfix/smtp[1404]: connect to alt2.gmail-smtp-in.l.google.com[2607:f8b0:400c:c0f::1b]:25: Network is unreachable
那么我需要更改端口以用于在谷歌计算机实例中的后缀工作？ Telnet外部谷歌网络工作正常！
谢谢！
[编辑]
经过调试与测试发送电子邮件到相同的电子邮件发送和recibe，从圆形立方体，并从雷鸟，所以我认为这个问题的外部流量的端口25和我不知道为什么后缀使用25端口，如果master.cf STMP端口设置为597
mail.log调试从roundcube
Aug 25 00:58:59 localhost dovecot: imap([email protected]): Debug: maildir++: root=/var/mail/vmail/inova.cloud/info, index=, indexpvt=, control=, inbox=/var/mail/vmail/inova.cloud/info, alt=
Aug 25 00:58:59 localhost dovecot: imap([email protected]): Logged out in=50 out=511
Aug 25 00:59:22 localhost postfix/qmgr[952]: 494C582008: from=<[email protected]>, size=524, nrcpt=1 (queue active)
Aug 25 00:59:22 localhost postfix/qmgr[952]: 4F95180D0A: from=<[email protected]ajestic-lodge-173213.internal>, size=461, nrcpt=1 (queue active)
Aug 25 00:59:22 localhost postfix/error[1435]: 494C582008: to=<[email protected]>, relay=none, delay=4617, delays=4617/0.06/0/0.01, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect t$
Aug 25 00:59:22 localhost postfix/error[1436]: 4F95180D0A: to=<[email protected]>, relay=none, delay=80226, delays=80226/0.03/0/0.01, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect$
Aug 25 00:59:59 localhost dovecot: imap-login: Debug: SSL: elliptic curve secp384r1 will be used for ECDH and ECDHE key exchanges
Aug 25 00:59:59 localhost dovecot: imap-login: Debug: SSL: elliptic curve secp384r1 will be used for ECDH and ECDHE key exchanges
Aug 25 00:59:59 localhost dovecot: auth: Debug: auth client connected (pid=1442)
Aug 25 00:59:59 localhost dovecot: auth: Debug: client in: AUTH#0111#011PLAIN#011service=imap#011secured#011session=0wbZdolXxJkAAAAAAAAAAAAAAAAAAAAB#011lip=::1#011rip=::1#011lport=143#011rport=39364#011resp=AGl$
Aug 25 00:59:59 localhost dovecot: auth-worker(1430): Debug: sql([email protected],::1,<0wbZdolXxJkAAAAAAAAAAAAAAAAAAAAB>): query: SELECT email as username, pwd AS password FROM addresses WHERE email = '[email protected]$
Aug 25 00:59:59 localhost dovecot: auth: Debug: client passdb out: OK#0111#[email protected]
Aug 25 00:59:59 localhost dovecot: auth: Debug: master in: REQUEST#0112225078273#0111442#0111#0117898818d71c58f150c8d4f75bb936fb5#011session_pid=1443#011request_auth_token
Aug 25 00:59:59 localhost dovecot: auth-worker(1430): Debug: sql([email protected],::1,<0wbZdolXxJkAAAAAAAAAAAAAAAAAAAAB>): SELECT 5000 AS uid, 5000 as gid, email, '/var/mail/vmail/domain/info' AS home FROM$
Aug 25 00:59:59 localhost dovecot: auth: Debug: master userdb out: USER#0112225078273#[email protected]#011uid=5000#011gid=5000#[email protected]#011home=/var/mail/vmail/domain/info#011auth_token$
Aug 25 00:59:59 localhost dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=::1, lip=::1, mpid=1443, secured, session=<0wbZdolXxJkAAAAAAAAAAAAAAAAAAAAB>
Aug 25 00:59:59 localhost dovecot: imap([email protected]): Debug: Added userdb setting: plugin/[email protected]
Aug 25 00:59:59 localhost dovecot: imap([email protected]): Debug: Effective uid=5000, gid=5000, home=/var/mail/vmail/inova.cloud/info
Aug 25 00:59:59 localhost dovecot: imap([email protected]): Debug: Namespace inbox: type=private, prefix=, sep=, inbox=yes, hidden=no, list=yes, subscriptions=yes location=maildir:/var/mail/vmail/domain/info
Aug 25 00:59:59 localhost dovecot: imap([email protected]): Debug: maildir++: root=/var/mail/vmail/domain/info, index=, indexpvt=, control=, inbox=/var/mail/vmail/domain/info, alt=
Aug 25 00:59:59 localhost dovecot: imap([email protected]): Logged out in=50 out=511
从外面电子邮件发送它不recive