What You Can Do with the Antispam Features

• Create a white list (trusted addresses) of email addresses, domains, and subnet masks that bypass content filtering.
• Use connection filtering to compare email messages against configurable DNS black lists to determine if they are from IP addresses that are known to send spam.
• Enable verification checks (connection filtering) to verify the "Mail FROM" address, HELO/EHLO domain information, and perform a reverse DNS lookup on incoming email messages.
• Use the Sender Policy Framework (SPF) feature to increase the ability to stop incoming email from forged email addresses (spoofed email).
• Use the Premium Antispam filter (available in the ICS Premium, IMail Plus and IMail Secure Server suites only) to automatically manage spam protection with the Mail-Filters antispam technology. Premium Antispam filter settings are applied to incoming mail before Standard Antispam filter settings.
• Use phrase filtering (content filtering) to configure a phrase list that searches for specific spam phrases within the subject and body of email messages.
• Enable statistical filtering (content filtering) to analyze each message and determine if it is spam.
• Enable HTML feature filtering to search messages for HTML tags that could be used to disguise spam.
• Create a URL Domain Black List that searches for domain names (URLs) contained within HREF and IMG SRC HTML tags and in plain text messages.
• Enable broken MIME header filtering to treat emails with malformed MIME headers as spam.
• Configure delivery rules to trap messages based on spam X-Headers that are inserted when a mail message fails a spam test.