Role-based delegation without password sharing: architecture walkthrough
A complete architecture overview of how TwinMail enables permissioned access to accounts and people without exposing credentials.
Engineering Blog
From the Twindevs engineering team
Technical deep-dives on architecture, security, and product decisions.
MBOX/PST archive ingest at scale: checkpoint recovery and progress determinism
How TwinMail handles multi-gigabyte archive imports with deterministic progress tracking, checkpoint resume, and corruption-tolerant parsing.
Designing the per-action AI consent model: tradeoffs and UX constraints
Every AI action in TwinMail shows its inputs and outputs in a glass-box pattern. We describe the design process, UX tradeoffs, and the consent sheet architecture.
Why we chose XChaCha20-Poly1305 over AES-GCM for vault encryption
A detailed comparison of cipher suite tradeoffs for local-first email storage, including nonce safety, key derivation, and performance on consumer hardware.
Building a local-first CRDT sync layer for encrypted email vaults
How we designed a conflict-free replicated data type layer that operates on encrypted vault boundaries without exposing plaintext to any sync server.
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