Symptoms
You have a Google Cloud server that can receive mail but cannot send mail.
Description
Google Cloud intentionally blocks outbound mail on port 25. This is stated in Google's official documentation that can be found here.
Because Google Cloud blocks outbound mail, you must configure a smart host that can send mail on behalf of your server.
Resolution
You can use one of the following guides to learn how to configure a smart host for your server so that you may send mail on Google Cloud servers:
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