Choosing the operation mode
FortiMail™ Secure Messaging Platform Version 4.0 Patch 1 Install Guide
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Choosing the operation mode
Once the FortiMail unit is mounted and powered on, and you have connected to either the
FortiMail unit’s web-based manager or CLI, you can configure the operation mode of the
FortiMail unit.
FortiMail units can run in one of three operation modes: gateway mode, transparent mode,
and server mode. Requirements of each operation mode vary.
In addition, some FortiMail features are specific to the operation mode. As a result,
changing the operation mode may reset your FortiMail configuration.
You will usually choose the operation mode that is appropriate for your topology and
requirements and configure the operation mode only once, during installation, before
using the Quick Start Wizard.
This section describes each operation mode, assisting you in choosing the operation
mode that best suits your requirements.
This section contains the following topics:
• Characteristics of gateway mode
• Characteristics of transparent mode
• Characteristics of server mode
• Configuring the operation mode
Table 4: Comparison of gateway, transparent, and server mode of operation
Gateway Transparent Server
SMTP role MTA/relay Transparent
proxy/relay
Server
FortiMail unit is hidden No Yes, if enabled No
Email user accounts Preferences and
per-recipient
quarantine only
Preferences and
per-recipient
quarantine only
Yes
Requires DNS record change Yes No, if hidden
with no per-
recipient
quarantines or
Bayesian scan
Yes
May require changes to SMTP
client configurations or other
infrastructure
Yes No Yes
Requires FortiMail unit located
between external MTAs and
protected email server(s)
No Yes N/A
(FortiMail unit
acts as email
server)
Protected email server(s) Separate Separate Integrated
(FortiMail unit
acts as email
server)
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