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I am creating a firewall rule on gcp for mailjet. How do I choose what destination ip address range to use ?

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Based on : Php Mailer Function not working on Google Cloud Platform

Under Destination filter, set 0.0.0.0/0 if you want to allow egress traffic from the VM instance to any destination. If you want to limit the destination, enter another IP range here. THIS IS IMPORTANT IF YOUR EMAIL IS HOSTED SOMEWHERE ELSE.

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