Scan-to-Email is convenient, but convenience should not create an uncontrolled path for business information. Blocking personal email destinations at the relay layer is one of the simplest ways to reduce an unnecessary exfiltration path without disabling Scan-to-Email entirely.
Why this matters
Start with an allow-list of approved company domains or specific recipient addresses.
Decide whether any departments legitimately need external recipients and document those exceptions.
Think in terms of least privilege
The copier should be allowed to do what the business needs and no more. That means limiting who can use the relay, where messages can go, which mailbox or account is involved, and how much access the relay itself receives from Microsoft or Google.
Practical points to consider
- Log blocked attempts so administrators can identify training issues or suspicious behavior.
- Combine destination controls with sender restrictions so only authorized copiers and devices can use the relay.
- Review the policy periodically as domains, subsidiaries, and approved vendors change.
What a supportable setup looks like
A good Scan-to-Email design should be understandable months after it is installed. IT should know which device is sending, which cloud connection is being used, which destinations are permitted, and where to look when delivery fails.
That usually means using a dedicated or clearly owned sender identity, encrypted credentials or tokens, modern TLS on the cloud side, useful logs, and a documented reconnect process. It also means avoiding broad permissions simply because they are easier to configure.
Where CM Relay fits
CM Relay is designed as the compatibility and policy layer between copiers or other SMTP devices and modern cloud services. The copier can continue using a familiar SMTP workflow while CM Relay handles OAuth-based delivery, connection health, logging, and policy controls such as sender and destination restrictions.
That approach lets an organization modernize the email path without turning a copier replacement project into the only security option.
Further reading
- https://www.ftc.gov/business-guidance/blog/2017/08/stick-security-control-access-data-sensibly
- https://www.verizon.com/business/resources/T2d0/reports/2024-dbir-data-breach-investigations-report.pdf
- https://ico.org.uk/for-organisations/report-a-breach/personal-data-breach/personal-data-breach-examples/
Next step
If your organization is still relying on old SMTP credentials, inconsistent copier settings, or manual workarounds, start by documenting the current Scan-to-Email path. From there, you can decide which parts need to be modernized without disrupting the user experience.
https://cmrelay.com/features/ or https://cmrelay.com/contact/ to discuss your environment.