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 documented here:
https://cloud.google.com/compute/docs/tutorials/sending-mail
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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