专用子网中的EC2 587端口上的Gmail SMTP超时

Question

我有几个在私有子网中运行的ec2实例，其中一个需要使用SMTP通过587端口发送电子邮件，因为EC2在私有子网中，我认为即时通讯正在通过该端口超时，是否有办法解决此问题

Answer 1

---- updated(20min later)

Problem located on our ACL configuration. added:

port: 587

source: 0.0.0.0/0

To Allows inbound traffic under your public ACL which your NAT used.

---- original

Same problem here. We can use 587 from the public subnet, but private subnet not works.