Google Compute Engine does not allow outbound connections on ports 25, 465, and 587. By default, these outbound SMTP ports are blocked because of the large amount of abuse these ports are susceptible to. You can find more information on how to send email from a VM and what services to use on the "Sending Email from an Instance" documentation page <https://cloud.google.com/compute/docs/tutorials/sending-mail/>.
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