Inbound Email Processing Checklist for Healthcare and Compliance

Complete a Business Associate Agreement and produce a data flow diagram that traces ePHI from SMTP ingress to storage, parsing, routing, and API consumers. This clarifies responsibilities and reduces audit gaps.

Inventory inbound workflows (referrals, prior auth, patient photos) and specify the minimum PHI needed at each step. Configure parsers and logs to exclude everything else.

Establish retention periods by record type, automate purge jobs for raw EML and parsed artifacts, and define a legal hold override. Verify policies align with HIPAA and state rules.

Confirm storage locations meet organizational and contractual residency constraints, and segregate compliance-tier data from non-PHI traffic at the account or tenant boundary.

Create a control matrix that links HIPAA safeguards to pipeline controls such as TLS, RBAC, DLP, and vendor security attestations. Keep evidence ready for audits.

Evaluate attack vectors like spoofed senders, malicious attachments, and webhook abuse. Rank risks, document compensating controls, and plan validation tests.

Create unique subdomains and mailboxes per workflow (e.g., referrals@, claims@) with clearly scoped routing rules. This simplifies least-privilege access and auditing.

Require modern cipher suites and reject cleartext SMTP for PHI-bearing traffic. Monitor TLS negotiation failures and alert if senders drop to cleartext.

Compute authentication results and quarantine or flag failures for manual review. Store auth results with the message for downstream trust rules.

Manage private keys in a hardware-backed KMS and decrypt before parsing. Log key usage and protect key material under strict RBAC and audit.

Restrict SMTP ingress to known partner IPs for high-sensitivity workflows like radiology results. Maintain change control for allowlist updates.

Throttle high-volume sources and reject forwarding loops that flood clinical queues. Enforce per-sender quotas with alerts on burst anomalies.

Detect out-of-office notices and bounce messages using headers and heuristics, then divert them from patient-facing or ticket-creating endpoints.

Extract envelope, headers, and body parts while retaining original headers for traceability. Include canonicalized content-type and charset for each part.

Use pattern rules for MRN formats, DOB, SSN, and insurance IDs plus context-based checks. Tag findings with confidence scores for routing and redaction.

Accept only vetted types like text/plain, text/html, pdf, and tiff. Remove scripts, active content, and non-essential inline images to reduce risk.

Perform multi-engine antivirus scans and detonate high-risk archives in a sandbox. Quarantine or strip password-protected ZIPs pending validation.

Apply OCR to TIFF, JPEG, and scanned PDFs to surface embedded ePHI for downstream routing and DLP checks. Store OCR confidence with the payload.

Replace detected PHI with tokens in non-clinical logs and analytics, retaining reversible mappings only in secure vaults with strict access controls.

Stream large attachments and reject messages exceeding predefined limits for your pipeline. Provide clear NDR instructions for senders when limits are hit.

Sign payloads with a rotating secret, require clock-skew bounded timestamps, and reject replays via nonce caches. Log signature verification results.

Deduplicate using message-id or a hashed canonical form so retries do not create duplicate encounters or tasks in EHR or ticketing systems.

Buffer inbound notifications, apply exponential backoff on failures, and route poisoned messages to a dead-letter queue with alerting and triage instructions.

Link messages to patients via MRN in body or attachments only after authenticity checks, and fall back to manual review when identifiers are ambiguous.

Use keywords, NPI, location codes, and specialty tags to route to care teams or service lines. Maintain rules as code with change control.

Persist the original message and normalized JSON in object storage using envelope encryption and strict RBAC. Reference artifacts by content hash for integrity.

Normalize structured content into FHIR DocumentReference or Communication resources to streamline ingestion into EHR interfaces and analytics pipelines.

Use red-team-safe examples that mimic clinical formats, including edge cases like nested multiparts and malformed headers. Automate regression tests.

Validate TLS enforcement, S/MIME decryption, and failure handling using known-good and intentionally broken samples. Verify alerts on decryption failures.

Forward normalized, signed logs to a write-once store and a SIEM. Enforce NTP across systems so message, webhook, and storage events align in audits.

Create rules for spikes in rejects, auth failures, signature mismatches, and DLP hits. Tune to reduce alert fatigue while preserving high-signal events.

Document recovery objectives, test cross-region failover for SMTP and webhooks, and verify message durability with replay from backlog or object storage.

Define containment, forensics, partner communication, and regulatory timelines. Pre-stage templates for patient notification if ePHI exposure is confirmed.