What You Can Do with the Antispam Features

• Create a White List (trusted addresses) of e-mail addresses, domains, and subnet masks that bypass content filtering.
• Use Connection Filtering to compare e-mail 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 e-mail messages.
• Use the Sender Policy Framework (SPF) feature to increase the ability to stop incoming e-mail from forged e-mail addresses (spoofed e-mail).
• Use the Premium Antispam filter (available with IMail Plus and IMail Premium only) to automatically manage spam protection with Commtouch Advanced Security Daemon (ctasd™) 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 e-mail 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 e-mails 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.