Gitlab on Google Kubernetes Engine and Gmail

When trying to use gmail (gsuite) with gitlab on GKE (configured using helm --set global.smtp…)
I get SSL verify errors.

I am unsure howto fix these.

I find the documentation for running gitlab on gke lacking, can someone point towards a forum where people discuss their findings?

I am leaving k8s, and going with a standard google vm instance instead, and spending the money on premium instead.