Employee email monitoring software that catches leaks without reading messages.
Metadata-first employee email monitoring software for corporate email surveillance done proportionally. Outbound email tracking with attachment DLP, external-domain alerts, and header-based phishing pattern detection. Body and subject content scanning stays opt-in and disclosed, and personal webmail is excluded from the message log by policy.
Available on Professional and Enterprise plans · No credit card required
Six signals every corporate email monitoring policy needs.
Envelope and header metadata, attachment metadata, and disclosed exceptions. Outbound email tracking, inbound phishing checks, and personal-mail exclusion. Nothing more, unless a written policy says otherwise.
Inbound & Outbound Email Metadata
Sender, recipient, external flag, size, attachment names, and timestamps for every business message. Outbound email monitoring logs the envelope only. Message bodies and subject lines stay inside your mail server.
Attachment DLP for Email
Email DLP rules on filename, extension, size, and hash. Warn the sender, log the event, or quarantine the outbound message for reviewer approval before it ever leaves the network.
External-Domain Alerts
Corporate email surveillance for traffic to competitor, freemail, or newly seen recipient domains. Configurable severity by domain list, sender role, and time-of-day pattern for outbound anomalies.
Phishing Pattern Detection
Header-based inbound checks for lookalike display names, mismatched Reply-To, newly registered senders, and SPF/DKIM/DMARC failures. No body reading required to catch the phish.
Personal-Mail Exclusion
Personal Gmail, Yahoo, Hotmail, and Proton tabs are excluded from the email monitoring log by policy. Only the tab visit appears in app and website tracking, never message metadata.
Encrypted Transport & Storage
Email metadata events travel over TLS 1.3 and rest under AES-256 with a hash chain. Chain-of-custody preserved for auditors, examiners, and insider-threat investigations.
One outbound email monitoring view for volume, external traffic, and DLP verdicts.
Every KPI on the corporate email surveillance dashboard drills to the underlying message event. Every event lands with sender, recipient, external flag, and DLP verdict, no message body attached.
Hourly email volume
Top external recipient domains
How metadata-first email DLP works, from message event to reviewer action.
Envelope capture, policy evaluation, and alert or quarantine. Three steps that run every time a message crosses the boundary, all on your rules.
Scan metadata
On send and receive, eMonitor captures the envelope, headers, and attachment metadata. Sender, recipient, external flag, size, attachment name, extension, and hash. Message bodies stay in your mail server.
Apply rules
The policy engine evaluates each event against your DLP rules, external-domain lists, phishing checks (SPF, DKIM, DMARC, lookalike display names), and volume baselines. Personal webmail tabs are dropped at this stage.
Alert or quarantine
Log-only, warn the user, notify a reviewer, or quarantine the message for release approval. Alerts land in the dashboard, Slack, Teams, or a webhook to your SIEM in under a second.
Every email monitoring event carries the metadata reviewers need, and nothing else.
Structured, exportable, and immutable outbound email tracking records. No body, no subject, and no attachment content is stored under the default policy.
Four jobs outbound email monitoring and metadata-first DLP handle best.
Insider threat email exfiltration detection
- Catch outbound-to-freemail volume spikes in the days before a resignation
- Flag BCC to competitor recipient domains as severe by default
- Correlate email metadata with USB events and file access signals
- Feed clean outbound events into your SIEM via REST API or webhook
Regulated finance and healthcare communication
- Supervisory review queues aligned with FINRA Rule 3110 broker-dealer workflow
- HIPAA-ready email attachment DLP for PHI-handling clinical teams
- Retain hash-chained event records for SEC and FINRA examiners
- Layer with an email archiving platform for full-message retention
Intellectual property and source-code protection
- Attachment rules on source-code archive types (.zip,.tar.gz,.7z) leaving the network
- Watch for large attachments to newly seen or freemail recipient domains
- Quarantine outbound messages and reviewer release for high-value teams
- Chain-of-custody attachment hashes for any litigation that follows
Compliance retention and audit trail
- Every email event timestamped, hash-chained, and exportable to CSV or JSON
- Retention configurable per plan and per regulation (SEC 17a-4, HIPAA, GDPR)
- Role-based access separates reviewers from analysts and administrators
- Pairs with activity logs for a full corroborated audit trail
Corporate email surveillance for teams regulators watch first.
Full-content email logging vs. metadata-first email DLP.
They solve different problems for outbound email monitoring. Here is when each approach earns its place.
| Dimension | Full-content logging | Metadata-first DLP |
|---|---|---|
| What it stores | Message body, subject, attachment content | Envelope, headers, attachment metadata, DLP verdict |
| Privacy impact | High, private text is read | Low, behavioral signals only |
| GDPR proportionality | Requires documented compliance basis | Aligned with proportionality by default |
| Employee trust | Reduced, messages are read | Preserved, disclosed and bounded |
| False positives | High, keyword matching on benign text | Lower, rules on domain, size, extension, hash |
| Setup | Mail gateway changes, MX-record edits | Desktop agent, minutes to deploy |
| Best for | FINRA/SEC supervised review of message text | Insider threat, IP protection, HIPAA safeguards, acceptable use |
Recommendation: Start with metadata-first monitoring. Add opt-in content scanning only where a specific regulation (typically FINRA-supervised broker-dealers) requires it, and disclose the change to employees in writing. Pair with DLP and USB blocking for a complete outbound-data posture.
Email monitoring events built for the audit that comes next.
Employee email monitoring that respects the people sending the messages.
- Metadata only by default. The shipped policy captures envelope headers, external flag, attachment name, size, and hash. Message bodies, subjects, and attachment content are not stored under this default.
- Content scanning is opt-in and disclosed. Enabling body or attachment content scanning requires an administrator action, a written business reason (usually FINRA supervision or HIPAA safeguards), and advance written notice to affected employees.
- Personal webmail is excluded. Personal Gmail, Yahoo, Hotmail, and Proton tabs are dropped at the policy engine. Only the tab visit appears in application usage totals. No metadata is captured from personal accounts.
- No body storage without policy. The event schema itself omits body and subject fields under metadata-only mode. If content scanning is later enabled, retention is scoped, role-gated, and revocable, aligned with our best-practices guide and country-by-country legal requirements.
Employee Email Monitoring FAQ
Is employee email monitoring legal?
Yes, in most jurisdictions monitoring employee email on employer-owned corporate accounts is legal when the practice is disclosed in writing, tied to a defined business purpose, and kept proportional. Rules tighten around personal messages, cross-border data transfer, and body-content review. eMonitor's metadata-first default and personal-mail exclusion are built to fit inside these limits without touching what the law protects.
Is corporate email monitoring GDPR-compliant?
GDPR does not ban corporate email monitoring, but it requires a lawful basis (usually legitimate interest), proportionality, data minimization, transparency to staff, and a Data Protection Impact Assessment for systematic monitoring. Metadata-first monitoring supports proportionality by capturing envelope headers, attachment metadata, and DLP verdicts instead of body content. Reading personal messages on a corporate account is generally not permitted.
What does eMonitor's email monitoring software capture?
Metadata by default: sender, recipient, external-domain flag, message size, attachment names, attachment size, timestamps, and DLP verdict. Subject lines and message bodies are not stored unless a policy explicitly opts in and employees are notified. Personal webmail (personal Gmail, Yahoo, Hotmail) is excluded from the message log.
Are personal email accounts monitored?
No. Personal webmail tabs (personal Gmail, Yahoo, Hotmail, Proton) are excluded from the message log by policy. Time spent on the tab may appear in application usage for productivity totals, but no metadata, no headers, and no message data are captured from personal accounts. Personal devices are outside monitoring scope entirely.
How does the outbound email DLP work?
eMonitor inspects outgoing attachment metadata (filename, extension, size, hash) against your rules: max-size thresholds, blocked extensions, sensitive filename patterns, and disallowed recipient domains. Violations can log-only, warn the user, or quarantine the message for reviewer approval. Attachment bodies are not read unless content scanning is opt-in.
What phishing patterns can the software detect?
Inbound-header analysis flags lookalike display names, mismatched Reply-To domains, newly registered sender domains, SPF/DKIM/DMARC failures, and known-bad URL patterns. Suspicious messages are surfaced in the review queue with the header trail. Detection uses envelope and header metadata, not body content, so it works under the metadata-first default.
Does email monitoring replace email archiving?
No. Archiving stores the full message body for retention obligations under FINRA, SEC 17a-4, and SOX. eMonitor handles real-time detection: external-domain flags, attachment DLP, phishing patterns, and volume anomalies. Regulated firms typically run both, archiving for retention and eMonitor for supervision alerts.
What compliance frameworks does this align with?
SOC 2 Type II, GDPR (proportionality supported by the metadata-only default), HIPAA-ready technical safeguards, ISO 27001, and the supervisory-review workflow needed for FINRA Rule 3110 alerts. All events are timestamped, hash-chained, and exportable to CSV, JSON, or REST API for auditors.
Related features
DLP & USB Blocking
Block or allow removable devices and combine USB events with email metadata for a full outbound picture.
Learn more →Activity Logs
Second-level, hash-chained event history that corroborates every flagged email event.
Learn more →Real-Time Alerts
Route email events to Slack, Teams, email, or SIEM webhooks the moment they trigger.
Learn more →Reporting & Dashboards
Turn email signals into executive-ready reports for legal, HR, and security reviewers.
Learn more →Compare eMonitor: Best Monitoring Software 2026 · vs Hubstaff · vs Time Doctor