What is the DLP feature?
The DLP (Data Loss Prevention) feature makes it possible to detect and block the sending of outbound emails containing sensitive data (e.g. passwords, social security numbers, IBANs, etc.), in order to reduce the risk of information leaks.
What are the prerequisites to enable DLP?
Before enabling DLP, you must:
Have Protect Out enabled and in use
Have the Protect Advanced offer
(The DLP feature is not available on the Protect Essential offer)
How to enable DLP?
You can enable DLP from the Protect interface, in General Settings.
Once enabled, analyses automatically start on outbound emails passing through the Mailinblack Protect solution.
What operating modes are available?
DLP offers two modes:
Apply automatic detection of sensitive data in outbound emails
Apply custom detection of sensitive data in outbound emails
1. Automatic detection
This mode is recommended if you want simple and fast protection.
Automatic detection of common sensitive data
Examples:
Social security number
Password
IBAN
No technical configuration required
👉 Ideal if you are not familiar with technical expressions and want standard blocking on outbound emails.
2. Custom detection
This mode allows tailored detection according to your needs.
Import of a CSV file (a template is provided)
File content:
1 keyword per line, or
1 regular expression (regex) per line
As long as there is one element per line, the format is valid.
In this context:
The file is visible and downloadable from the interface
It can be re-imported to allow modification (adding new words or expressions)
It is possible to delete the file if necessary
What happens once DLP is enabled?
Outbound emails are analyzed on:
The subject
The email body
In case sensitive data is detected:
The email is blocked and quarantined in Outbound Emails
It is tagged “Sensitive data”
Is the user informed if their email is blocked?
The user receives a notification email indicating the reason for the block (e.g. “password detected”).
The content is never displayed (the password or the specific data is not revealed).
Can managers be notified when an outbound email is blocked?
Managers can enable alerts to be informed by email when an outbound email is blocked due to sensitive data.
To enable the alert:
Go to Protect → Settings → Alerts, then check “Blocked Sensitive data”.
Can DLP be enabled only for certain users?
It is possible to create rules to enable DLP for a specific user group from
Settings → Rules → Edit or add a rule.
This allows a gradual or targeted deployment according to your internal needs.
