问题描述
默认情况下，Google的计算引擎会阻止所有传出电子邮件端口.引用计算引擎文档
Google's compute engine blocks all outgoing email ports by default. Quote from Compute Engine Documentation
作为对此的解决方案，Google建议使用SendGrid之类的第三方网站来管理电子邮件. SendGrid可以轻松地帮助您发送电子邮件，但是接收电子邮件并非易事.
As a solution to this, Google advices the use of third-party sites like SendGrid to manage email. SendGrid can easily help you send email, but receiving emails is not so easy.
在服务器上安装电子邮件客户端无济于事，因为这些客户端与其他服务器进行通信以接收电子邮件的端口仍然被阻塞.
Installing an email client on the server won't help because the ports through which these clients need to communicate with other servers to receive emails remain blocked.
我的问题是，最简单的接收电子邮件的解决方案是什么? SendGrid的解决方案用于发送电子邮件，并且Compute Engine文档中对此进行了指定.我已经安装了postfix，但是所有发送到服务器的电子邮件都会收到超时错误，并且我的收件箱仍然为空.
My question is what's the easiest solution to receiving email? SendGrid's solution is for sending emails, and the Compute Engine Documentation specifies this. I've installed postfix but all emails to my server receive timeout errors, and my inbox remains empty.
推荐答案
TL; DR -您说的正确，外发电子邮件端口被阻止，但外发电子邮件端口没有被阻止.如果打开它们，然后运行一个邮件服务器来侦听传入的电子邮件-您仍然可以接收它们.您只需使用SendGrid之类的第三方电子邮件发件人网关即可发送电子邮件.
TL;DR - You're right outgoing email ports are blocked, but incoming email ports are not. If you open them, and run a mail server which listens for incoming emails - you can still receive them. You will need to use 3rd party email sender gateways like SendGrid only to send the emails.
所有到端口25/465/587的传出通信都被阻止，因此人们不会滥用GCE发送垃圾邮件，网络钓鱼等电子邮件.
All outgoing traffic to port 25/465/587 are blocked so that people do not abuse GCE for sending out spam, phishing, etc. emails.
您仍然可以运行仅接收电子邮件的邮件服务器.换句话说，没有提及到这些端口的传入流量被阻止.默认情况下，GCE防火墙阻止所有传入流量.您将必须使用防火墙规则打开这些监听端口.
You can still run a mail server which just receives emails. In other words, there is no mention that incoming traffic to those ports are blocked. By default GCE firewall blocks all incoming traffic. You will have to open up these listening ports using firewall rules.
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