ZyXEL Communications ZyWALL 5 Support Notes page 238

ZyWALL 5 Support Notes
In ANTI-SPAM -> External DB, check Enable External Database with adjusting the threshold scroll bar
which let external database help IT staff to adjudge whether the POP3/SMTP mails are spam mails or not.
TIPS: To activate the "External DB" option, the ANTI-SPAM service license must be activated.
2. Protect Self-hosted Mail Servers (SMTP)
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