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FortiMail logs can help identify a suspicious email, its recipient, how the gateway handled it, and whether antivirus detected a risky attachment. They do not establish that someone opened a file on a separate server or ran web-shell commands. Treat gateway records as leads, then test suspected file access or web-shell activity against the affected host’s own logs and telemetry.
What FortiMail logs can—and cannot—show
FortiMail is an email-security gateway. Its documented records cover mail traffic and disposition, mail-protocol or webmail activity, email threat detections, and administration of the FortiMail appliance. They are not documented as server-side file-open or web-shell command-execution logs.
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That distinction matters during an incident: a suspicious attachment or message can point responders toward a recipient or time window, but it does not prove the attachment was opened, written to a web server, or executed. Likewise, FortiMail administration events concern the gateway itself, not a separate web server.
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Which FortiMail records to review
Record names and fields can vary by FortiMail release. Use the log reference for the installed version; the table describes categories and uses reflected in Fortinet documentation.
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Fortinet FortiMail FML-200F Network Security/Firewall Applianc - 4 Port - 10/100/1000Base-T Gigabit Ethernet - 4 x RJ-45 - 1U - Rack-mountable
- FortiMail is a top-rated secure email gateway that stops volume-based and targeted cyber threats to help secure the dynamic enterprise attack surface, prevents the loss of sensitive data and helps
- High performance physical and virtual appliances deploy on-site or in the public cloud to serve any size organization - from small businesses to carriers, service providers, and large enterprises
- Threat Prevention Powerful antispam and antimalware, are complemented by advanced techniques like outbreak protection, content disarm and reconstruction, sandbox analysis, impersonation detection
- Data Protection Robust data loss prevention, identitybased email encryption and archiving help prevent the inadvertent loss of sensitive information and maintain compliance with corporate and
- Security Fabric Integration Integrations with Fortinet products as well as third-party components help customers adopt a proactive approach to security by sharing IoCs across a seamless Security
| Record | Documented scope | Investigative use |
|---|---|---|
statistics / history (alog) |
Email traffic through relay or proxy and the action FortiMail took. Fortinet says history logs describe the action taken by the unit. | Locate the message, recipient, time, disposition, and session ID for correlation. |
event (elog) |
Mail activity including SMTP, POP3, IMAP, and webmail. | Reconstruct protocol or webmail activity around a message. |
virus (vlog) |
Virus and suspicious-message detections; cited subtypes include infected, malware-outbreak, and file-signature. |
Review attachment detections, signatures, and scan outcomes. |
kevent (klog) |
System management, configuration changes, and administrator or user logins and logouts. | Check for unexpected management activity on the FortiMail appliance. |
spam (slog) |
Spam-detection events. | Add classification context when the same session or message appears. |
Sources: Fortinet’s FortiMail 7.6.3 logging guide, FortiMail 8.0.0 subtype reference, and FortiMail 7.4.0 log types.
Review and correlate the records
- Set the incident window. Express the suspected period in UTC and note the appliance’s displayed timezone and clock alignment. Record the FortiMail version, operating mode, relevant protected domains and policies, and which local or remote log stores are available.
- Find the message in history or statistics. In Monitor > Log or the configured remote log system, inspect records around the suspected message or recipient. Capture the session ID, disposition, sender, recipient, time, subject or message identifier when present, source/client details, and displayed threat classification.
- Pull related records by session. Use Cross Search or follow the session ID to find associated event, antivirus, and antispam records. Fortinet states that email-related logs carry a session identification number that corresponds across relevant log types. A missing related record may reflect logging configuration or retention rather than the absence of activity.
- Examine antivirus evidence. Note the subtype, attachment name or type when available, detection name or signature, scan result, and any FortiSandbox or FortiNDR analysis. Compare the attachment against indicators through your approved response process. FortiMail’s antivirus profile determines scan coverage: documented options include headers, bodies, attachments, and compressed attachments, with optional heuristic, file-signature, FortiNDR, or FortiSandbox analysis. File-signature checks can use configured SHA-1 or SHA-256 values for supported attachment formats; no match does not establish that a file is benign. See Fortinet’s antivirus profile configuration guide.
- Review appliance administration events. Inspect
keventrecords for administrator logins, configuration changes, updates, and other management actions. Compare the user, source or interface, action, status, and time against expected operations. Do not confuse these appliance events with a mail user’s webmail or protocol activity. - Pivot to the recipient endpoint or web server. Use the host’s web access and error logs, authentication records, filesystem timestamps or audit records, process/endpoint telemetry, and relevant network records to determine whether the attachment was accessed, written, or executed and whether a web-shell URL or command was invoked. Attribute file and process activity to host evidence, not to FortiMail alone.
- Preserve and document evidence. Export original records, note collection times and timezones, and document coverage gaps. Preserve original timestamps when correlating gateway and host records.
Check logging coverage before interpreting gaps
An empty search is not proof that no event occurred. FortiMail administrators can choose recorded severity and local or remote destinations, including Syslog or FortiAnalyzer. Before treating missing entries as exculpatory, verify:
Rank #2
Fortinet FortiMail-200F Hardware Plus 1 Year 24x7 FortiCare and FortiGuard Enterprise ATP Bundle FML-200F-BDL-641-12
- FortiMail is a top-rated secure email gateway that stops volume-based and targeted cyber threats to help secure the dynamic enterprise attack surface, prevents the loss of sensitive data and helps
- High performance physical and virtual appliances deploy on-site or in the public cloud to serve any size organization - from small businesses to carriers, service providers, and large enterprises
- Threat Prevention Powerful antispam and antimalware, are complemented by advanced techniques like outbreak protection, content disarm and reconstruction, sandbox analysis, impersonation detection
- Data Protection Robust data loss prevention, identitybased email encryption and archiving help prevent the inadvertent loss of sensitive information and maintain compliance with corporate and
- Security Fabric Integration Integrations with Fortinet products as well as third-party components help customers adopt a proactive approach to security by sharing IoCs across a seamless Security
- Which log categories and severity levels were enabled during the incident window.
- Whether logs were stored locally, forwarded to Syslog or FortiAnalyzer, or both.
- Retention and whether relevant records have expired or been overwritten.
- Clock alignment and timezone on FortiMail and the investigated host.
- The installed product version and the matching log reference, since names and fields differ by release.
Fortinet’s guidance on FortiMail logging and FortiMail 8.0 logging describes logging configuration and destinations.
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Quick Recap
Bestseller No. 1
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Rank #4
FORTINET FortiGate-1801F Network Security Appliance (FG-1801F)
- FORTINET FortiGate-1801F Network Security Appliance (FG-1801F)
- The FortiGate 1801F delivers high performance next generation firewall (NGFW) capabilities for large enterprises and service providers. With multiple high-speed interfaces, high-port density and highthroughput, ideal deployments are at the enterprise edge, hybrid and hyperscale data center core and across internal segments. Leverage industry-leading IPS, SSL inspection and advanced threat protection to optimize your network’s performance.
- Custom SPU processors deliver the power you need to detect malicious content at multi-Gigabit speeds; Other security technologies cannot protect against today’s wide range of content and connection-based threats because they rely on general-purpose CPUs, causing a dangerous performance gap.
- Hardware: 198 Gbps | IPS: 13 Gbps | NGFW: 11 Gbps | Threat Protection: 9.1 Gbps; Interface: 4 x 40 GE QSFP+ slots, 12 x 25 GE SFP28 /10GE SFP+ slots, 2x10GE SFP+ HA slots, 8 x GE SFP slots, 18 x GE RJ45 ports, SPU NP7 and CP9 hardware accelerated, 2x 1TB on board SSD storage
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