Today in unintended-consequences land: If you send an email from Gmail to a SMTP server hosted on Google Cloud Platform ... it will send over an internal, private IP, not from the public Gmail IPs. So the SPF check will fail on those emails since SPF is a sender IP check. 1/2
That's astonishing. What happens if your VPC subnet uses the same address range as Gmail?
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¯\_(ツ)_/¯ I’m not ruling out the possibility that I might be making a mistake, but this is a very simple setup, there is not much space to make a mistake.
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It’s either broken because my GCP cluster runs inside Google’s private internal IP address space, or broken because their default K8s configuration somehow eats the external IPs and replaces them with Google internal IPs, which would be a major flashing caveat.
End of conversation
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