How to fix unencrypted scan-to-email: the remediation guide for audit findings.
Your assessment report flagged unencrypted scan-to-email, or you found it yourself before the assessor did. This guide covers what the finding means, which frameworks it fails, the remediation options with what each one actually closes, and the five-step plan that resolves the finding before the next exam cycle.
What the finding says and what it means
The finding appears under different names depending on who wrote the report: unencrypted scan-to-email, plaintext SMTP transmission from multifunction devices, cleartext transmission of sensitive information from print devices, or MFP scan-to-email lacking encryption in transit. All describe the same condition. Multifunction printers on the network transmit scanned documents over SMTP without end-to-end encryption. The message and attachment cross one or more relays in plaintext or with hop-by-hop TLS that can silently downgrade, then persist unencrypted in recipient mailboxes, archives, and backups outside the organization's control.
The condition matters because scanned documents are routinely the most sensitive documents in the building: loan files, patient records, student records, deal jackets, signed authorizations. The transmission path they take is the least controlled one on the network.
The frameworks unencrypted scan-to-email fails
| Framework | Requirement it fails | Who checks |
|---|---|---|
| GLBA / Interagency Guidelines | Encryption of customer information in transit under section 501(b) | FFIEC IT examiners |
| FTC Safeguards Rule | Encryption in transit at 16 CFR 314.4(c)(3) | FTC, plus assessors hired for the written risk assessment |
| HIPAA Security Rule | Transmission security at 164.312(e)(1) | OCR audits and business-associate assessments |
| NCUA Part 748 | Appendix A information security program elements | NCUA examiners |
| NY DFS Part 500 | Encryption of nonpublic information in transit at 500.15 | DFS-regulated entity certifications |
| FERPA / COPPA 2026 | Safeguards for student records and children's data | State K-12 audits and vendor assessments |
| NIST 800-53 | SC-8 transmission confidentiality and integrity | Federal contractors, FedRAMP assessors |
| SOC 2 | Trust Services Criteria CC6.6 and CC6.7 | Type II auditors |
| Cyber insurance | Encryption-in-transit attestations on renewal questionnaires | Underwriters at renewal |
Security assessors, IT audit firms, network security consultancies, and virtual CISO practices increasingly test the scan path because it fails several of these at once. One walkthrough question surfaces it: show me how a scan gets from this device to an outside recipient.
The four examiner questions the current path cannot answer
Whatever framework the assessment runs under, the walkthrough converges on four questions. Who received the document. When. From where. Has anyone else touched the record since. Plaintext SMTP cannot answer any of the four reliably: headers can be forged, recipient lists are partial, the TLS leg can fall back, and retention at the recipient mailbox is uncontrolled. A remediation that cannot answer the four questions will resurface at the next assessment as a repeat finding.
Remediation options and what each one closes
| Option | What it closes | What stays open | Verdict |
|---|---|---|---|
| Force SMTP-AUTH + STARTTLS at the relay | The device-to-relay hop, when every device supports it | Downgrade risk, mailbox persistence, no access log | Minimum hygiene, not remediation |
| Block outbound port 25 from the print VLAN | Rogue plaintext sends | Everything after the relay | Do it anyway, still not remediation |
| Secure email gateway / encrypted mail add-on | Mailbox-to-mailbox encryption for enrolled senders | The MFP-to-relay hop, recipient portal friction, retention sprawl | Partial, adds user friction |
| Scan-to-folder plus manual send | Removes email from the scan path | Adds a human step, folder permissions become the new finding | Workflow downgrade |
| End-to-end encrypted transport replacement | Full path encryption, zero mailbox persistence, per-document access log, all four examiner questions | Print-path controls (separate checklist) | Closes the finding |
SecureMFP is the end-to-end option: patented Secure Digital Transport between the device and the recipient, deployed in about five minutes per device with no firmware change on any major MFP brand. Documents move as encrypted links, not attachments, with 14-day auto-deletion and a per-document access log an assessor can read.
The five-step remediation plan
1. Inventory the fleet
Pull the MFP inventory from the MPS provider or print server. Record IP, SMTP relay, and whether TLS is enforced on the outbound hop. Most fleets show plaintext SMTP on 70 to 90 percent of devices.
2. Block plaintext at the edge
Block outbound port 25 from the MFP VLAN and force SMTP-AUTH with STARTTLS at the relay. This stops the worst exposure while the real fix deploys.
3. Deploy encrypted transport per device
Five minutes per device, no firmware change, no vendor swap, existing managed-print contract unchanged. A typical 100-device fleet completes in two to four weeks.
4. Map every scan workflow to an encrypted destination
Loan packets, patient intake, transcripts, deal jackets. Each workflow gets a routing rule that delivers to the receiving system with a recipient access log attached.
5. Document the closure for the assessor
The transport engine generates per-document evidence automatically. Register the control in the written information security program, attach the audit-log schema, and close the finding with evidence rather than a promise. The full playbook with per-industry detail is on the SecureMFP overview.
Finding language you can use in your next report
If you run assessments, examinations, or a virtual CISO practice, the language below is free to adapt in client reports. It names the condition precisely and points remediation at the transport layer rather than at relay settings that do not close the exposure.
Condition: Multifunction printers transmit scanned documents containing sensitive information via SMTP without end-to-end encryption. Transmissions may traverse external relays in cleartext and persist unencrypted in recipient mailboxes, archives, and backups outside organizational control.
Criteria: Encryption-in-transit requirements applicable to the organization, including GLBA 501(b) and the Interagency Guidelines, FTC Safeguards Rule 314.4(c)(3), HIPAA 164.312(e)(1), NIST 800-53 SC-8, or SOC 2 CC6.6 and CC6.7 as applicable.
Recommendation: Replace SMTP-based scan-to-email transport with an end-to-end encrypted document transport mechanism providing per-document recipient access logging and controlled retention. Interim measures: block outbound port 25 from print segments and enforce SMTP-AUTH with STARTTLS at the relay. Interim measures alone do not remediate the finding.
The For Auditors page carries the deeper walkthrough: the four-question evidence model, the audit-log schema, and coordination with our team ahead of a client exam cycle.
Remediation FAQ
Is scan to email secure?
Standard scan-to-email is not secure. It transmits documents over SMTP in plaintext or with hop-by-hop TLS that can downgrade silently, and the attachment persists unencrypted in every mailbox, archive, and backup it touches. That is why security assessments now flag it as a finding.
Does forcing TLS on the SMTP relay fix the finding?
No. TLS at the relay encrypts one hop. It does not control downgrade on later hops, does not remove mailbox persistence, and produces no per-document access log. Assessors who understand the path will re-flag it as a repeat finding.
How fast can the finding be closed?
Interim network measures deploy in a day. Full remediation with encrypted transport runs about five minutes per device, and a typical 100-device fleet completes in two to four weeks, inside a standard remediation window.
Does remediation require replacing the copier fleet?
No. Encrypted transport replacement works across HP, Canon, Xerox, Konica Minolta, Ricoh, Sharp, Toshiba, Kyocera, Lexmark, and Brother with no firmware change and no hardware swap. The existing managed-print contract is unchanged.
What evidence closes the finding at the next exam?
Per-document delivery evidence answering the four examiner questions, the control registered in the written information security program, and a retention policy the organization actually controls. SecureMFP generates the evidence automatically for every transmission.
Talk to a specialist about your remediation window
A SecureMFP specialist will map the finding language in your report to the specific remediation evidence your assessor expects, supply the control-language draft for your written information security program, and coordinate directly with your audit firm or examiner where useful. Thirty minutes is the standard slot, and a typical fleet completes remediation in two to four weeks.