Saskia Visser

Saskia is the deliverability team's authentication and cryptography specialist. Before joining Blue Spirit in 2020, she spent five years at TransIP (Dutch hosting provider) running the abuse-and-authentication function for their dedicated mail platform, and four years before that at a small Eindhoven security consultancy doing DKIM-and-DMARC remediation for Dutch banks and government agencies adapting to NTA 7516 (the Dutch healthcare email security standard).

Her current focus is the operational migration from RSA-2048 DKIM to ed25519, the rollout of dual-signing fallback strategies, and the increasingly important ARC sealing layer for forwarded mail. She wrote the internal Blue Spirit ed25519 rollout playbook in late 2024 — the document that was used to migrate all 11,400 client domains over a 16-week window with under 0.5% measured deliverability impact at any point in the transition.

Saskia is a regular contributor to OpenDKIM (specifically the key rotation tooling) and submitted three patches to the OpenARC project addressing edge cases in cv= tag handling for chains exceeding 3 hops — bugs that originally surfaced as a production incident on Blue Spirit's own ARC sealing service in October 2026 and were fully reproduced in upstream test corpora before submission.

She holds a CISSP and is a member of the IETF DKIM Working Group rechartered effort. Outside work she practices Brazilian Jiu-Jitsu (purple belt as of 2025), keeps a ham radio licence, and grows tomatoes obsessively in her allotment garden.