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In the ZyWALL/USG, go to CONFIGURATION > UTM Profile > Anti-Spam> Mail Scan.
Select Enable Sender Reputation Checking (SMTP only) to have the ZyWALL/USG
scan for spam e-mail by IP Reputation. Select Enable Mail Content Analysis to
identify Spam Email by content, such as malicious content. Select Enable Virus
Outbreak Detection to scan viruses attached in emails. Leave Query Timeout Settings to
be the default settings. Click Apply.
CONFIGURATION > UTM Profile > Anti-Virus > Anti-Spam> Mail Scan