# Antivirus Scanning Profile for POP3 Traffic

Note: This feature applies only to Juniper Networks security devices that support internal antivirus (AV) scanning.

Edit the following options to configure an antivirus (AV) profile for scanning POP3 traffic:

Enable: Click the check box to enable scanning of POP3 traffic. By default, scanning is enabled.

Scan Mode: Select the appropriate scan mode:

- scan-all: Select this mode to scan all traffic at all times.

- scan-intelligent: This default mode specifies the AV engine to use an algorithm that scans the traffic for the most common and prevalent viruses, including ensuring the file type is true and that it does not infect other files directly. Although this option is not as broad in coverage as scan-all, it provides better performance.

- scan-ext: Select this mode if you want all scanning decisions to be based on the file extensions in the traffic.

Decompress Layer: Enter a value between 1 and 4. The value specifies how many layers of nested compressed files the internal AV scanner can decompress before it executes the virus scan. The default setting for POP3 is 3. See Example.

If a message contains a compressed .zip file that contains another compressed .zip file, there are two compression layers, and decompressing both files requires a decompress-layer setting of 2. Valid settings are between 1 and 4, so the AV scanner can decompress up to 4 layers of compressed files.

Include Extension List: Select an extension list to include for AV scanning. This option instructs the security device to only scan files with extensions specified in the file extension list. Make sure the above scan-mode option is set to scan-ext. To create a file extension list, see File Extension Configuration.

Exclude Extension List: Select an extension list to exclude from AV scanning. This option instructs the security device to not scan files with extensions specified in the list. Make sure the above scan-mode option is set to scan-ext. To create a file extension list, see File Extension Configuration.

Email Notify: Notifies the sender or recipient about detected viruses or scanning errors.

virus sender: Notifies the sender if a virus is found in an email message.
scan error sender: Notifies the sender if an email message is dropped as a result of a scan error.
scan error recipient: Notifies the recipient if an email message is passed as a result of a scan error.