01
Staged deploymentPhase documentation, apply paths, verify paths, and controlled install order make change reviewable.
Proof / OpenBSD Mailstack
Security that survives rebuild and recovery.
Reproducible. Hardened. Operator controlled. The OpenBSD Mailstack treats a security-sensitive service as an operating lifecycle, not an installation recipe.
Defense, service, and recovery as one system
▣
EdgePF · IDS · VPN · TLS✉
TransportPostfix · filtering▰
MailboxDovecot · identity · state◎
AccessOSMAP · nginx⌁
ObserveHealth · logs · drift↻
RecoverRestore · rebuild · verifyMore than installation notes
A hardened system is only useful if it can be operated and recovered safely.
The project covers staged deployment, configuration rendering, exposure control, validation, secrets, monitoring, maintenance, backup, recovery, and regression testing.
Repeatable infrastructure
02
Exposure controlNetwork policy, TLS, service bindings, VPN, and operator-supplied exposure values are deliberate architecture.
03
ValidationRendered configuration, service state, repository gates, lab testing, and regression checks support repeatability.
Operating lifecycle
Build the system so a future operator can know its state.
Hardening that cannot survive patching, maintenance, staff change, a failed service, or disaster recovery is incomplete hardening.
Repeatable operating path
01
BuildControlled inputs02
VerifyServices · exposure · controls03
ObserveHealth · logs · security state04
MaintainPatch · change · validate05
RestoreBackup · rollback · rebuild✓
TrustVerify known-good stateWhat this proves
System hardening can become a maintainable operating discipline.
The project reasons across network controls, service architecture, secrets, data stores, mail transport, browser access, monitoring, automation, validation, and recovery as one security system.
Capability demonstrated
▰
Secrets & stateReusable configuration stays separate from credentials, keys, private runtime material, and operator-only state.
↻
ResilienceBackups are paired with restore, rebuild, and post-recovery verification.
◇
Public-safe engineeringReusable architecture can be shared without mirroring the live environment.
▦
Layered servicesResponsibilities remain explicit across operating system, network, mail, filtering, access, and monitoring layers.
Why a client should care
Sensitive infrastructure should be hardened, observable, recoverable, and understandable over time.
Secure systems engineering is strongest when the operating lifecycle is part of the design from the beginning.
OpenBSD Mailstack
▣
HardenedDeliberate surface and privilege.
◎
ObservableSecurity-relevant state stays visible.
↻
RecoverableRestore and rebuild are engineered paths.
✓
RepeatableKnown process replaces operator memory.