Serhii Tanichev

Kubernetes, Terraform, Ansible, ArgoCD, GitLab CI. Prometheus, Grafana, Loki. Python, Go, Bash. PostgreSQL, Redis, nginx. Under all of it: SMTP, DNS, SPF, DKIM, DMARC, Haraka.

Writing Kubernetes operators in Go, and eBPF tracing to see what a node actually does under load instead of guessing it off dashboards.

Email Spam Tester. You send one message to a disposable address and get back what the receiving side saw: 41 checks, each with the RFC section quoted under it.

Questions about SPF, DKIM and DMARC alignment, and about mail that used to arrive and stopped. Also bug reports on the tester, especially a report where a check got it wrong.