Scan inbound and outbound SMTP traffic

The example shows how to configure malware scanning for inbound and outbound emails.

Introduction

To configure SMTP scanning, create the following firewall rules:

• Scan inbound SMTP and SMTPS traffic to the mail server.
• Scan outbound SMTP/S, POP/S, and IMAP/S traffic.

Scan inbound SMTP traffic

Specify the firewall rule settings to scan inbound SMTP and SMTPS traffic to an internal mail server.

1. Go to Rules and policies > Firewall rules. Select protocol IPv4 or IPv6 and select Add firewall rule. Select New firewall rule.

2. Specify the following settings:

   Name	Settings
   Source zones	Any
   Destination zones	Zone in which the internal mail server is hosted.
   Destination networks	Select the internal mail server.
   Services	Select the following: SMTP[S], SMTP
   Scan email content	Select the following: Scan SMTP Scan SMTPS

   The following image shows an example of how to configure the settings:

   

3. Click Save.

Scan outbound SMTP traffic

Specify the firewall rule settings to scan outbound SMTP and SMTPS traffic from the mail server.

1. Go to Rules and policies > Firewall rules.
2. Select the protocol IPv4 or IPv6 and select Add firewall rule.
3. Select New firewall rule.

4. Specify the following settings:

   Name	Settings
   Source zones	LAN
   Source networks and devices	Any
   Destination zones	WAN
   Destination networks	Any
   Services	Select the following: SMTP[S], SMTP POP3, POP3S IMAP3, IMAP3S
   Scan email content	Select the following: Scan SMTP Scan SMTPS

   The following image shows an example of how to configure the settings:

   

5. Click Save.