docker 容器内应用链接远程邮件服务器问题

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1. 我的 PVE 中 (192.168.1.99/24, 网关 192.168.1.1)

直接跑了个 docker 应用并创立了自己的网络 invoiceninja_invoiceninja
(网段 172.27.0.0/16, 网关 172.27.0.1)

同时在 docker-compose.yml 中指定了外部网络如下:
networks:
- invoiceninja
  extra_hosts:
- “in5.localhost:192.168.1.99 ” #host and ip
同时参考了这个帖子 https://www.v2ex.com/t/1042150
在 PVE 宿主机中增加了对应的邮件 smtp 端口, 但是容器中仍然无法链接远程 smtp 邮件服务器, 我该怎么做?

root@datahub:~# ufw allow from 172.27.0.0/16 to any port 25
Rules updated
root@datahub:~# ufw allow from 172.27.0.0/16 to any port 587
Rules updated
root@datahub:~# ufw allow from 172.27.0.0/16 to any port 465
Rules updated

上述 docker 容器内和 PVE 宿主都开了 ipv4 转发.

最后容器中运行 netstat -tln 如下.
“/var/www/app # netstat -tln
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 127.0.0.11:34747 0.0.0.0:* LISTEN
tcp 0 0 :::9000 :::* LISTEN “

PVE 宿主机中运行 netstat -tln 如下: (这是因为宿主机的 25/587/465smtp 相关端口没打开的原因吗?

root@datahub:/opt/invoiceninja/invoiceninja# netstat -tln
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:10000 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:8384 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:9000 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:85 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:52345 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:20172 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:20171 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:20170 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:35143 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:52283 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:3939 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:3838 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:2222 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:3000 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:7564 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22000 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22222 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:5005 0.0.0.0:* LISTEN
tcp6 0 0 :::10000 :::* LISTEN
tcp6 0 0 :::8384 :::* LISTEN
tcp6 0 0 :::9000 :::* LISTEN
tcp6 0 0 :::52283 :::* LISTEN
tcp6 0 0 :::3128 :::* LISTEN
tcp6 0 0 :::3306 :::* LISTEN
tcp6 0 0 :::3939 :::* LISTEN
tcp6 0 0 :::3838 :::* LISTEN
tcp6 0 0 :::2222 :::* LISTEN
tcp6 0 0 :::3000 :::* LISTEN
tcp6 0 0 :::2017 :::* LISTEN
tcp6 0 0 :::111 :::* LISTEN
tcp6 0 0 :::22 :::* LISTEN
tcp6 0 0 :::7564 :::* LISTEN
tcp6 0 0 :::8006 :::* LISTEN
tcp6 0 0 :::8080 :::* LISTEN
tcp6 0 0 :::6565 :::* LISTEN
tcp6 0 0 :::22000 :::* LISTEN
tcp6 0 0 :::22222 :::* LISTEN
tcp6 0 0 :::5005 :::* LISTEN
tcp6 0 0 ::1:25 :::* LISTEN