Anti-spam Overview

IMail standard edition includes standard anti-spam technology; IMail Premium includes Premium Anti-spam as well as Standard Anti-spam technology.

Premium Anti-spam

CYREN EmailSecurity uses the CYREN GlobalView™ Cloud, which collects and analyzes billions of transactions per day, to deliver unmatched insight into, and protection against emerging security threats. Our patented Recurrent Pattern Detection (RPD) automatically analyzes collected traffic to provide accurate spam and phishing classifications based on a unique global view of outbreaks.

CYREN's GlobalView™ Mail Reputation Service fights unwanted mail at the perimeter, reducing more than 85% of incoming messages at the entry-point, before these messages enter the network. Additionally, GlobalView can optimize traffic flow so that legitimate sources gain optimal access, while unauthorized sources attempting to abuse the network are blocked.

Standard Anti-spam

All IMail products include standard anti-spam features. These features are custom configured by the administrator to identify spam and prevent it from clogging your Inbox. Mail messages are passed through several layers of filters and tests to assure that maximum spam detection is achieved.

What You Can Do with the Anti-spam Features

• Use the Premium Anti-spam filter (optional only with IMail Premium) to automatically manage spam protection. Premium Anti-spam filter settings are applied before Standard Anti-spam filter settings.
• Enable statistical filtering (content filtering) to analyze each message and determine if it is spam.  
• 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 HTML feature filtering to search messages for HTML tags that could be used to disguise spam.
• Create a URL Domain Blacklist 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.
• 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 connection filtering to compare e-mail messages against configurable realtime blacklists to determine if they are from IP addresses that are known to send spam.
• Create a white list (trusted addresses) of e-mail addresses, domains, and subnet masks that bypass content filtering.
• 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.
• Configure delivery rules to trap messages based on spam X-Headers that are inserted when a mail message fails a spam test.

Which Anti-spam Settings are Used to Check a Message?

The anti-spam filters used to scan a message are determined by the IMail domain settings of the IP address that the message is received on.  If the message is received on an IP address that is not configured for IMail, the primary domain's anti-spam filter settings are used.

Spam Actions

If a message is identified as spam, you can set IMail Server to delete it, send it to an e-mail address, or insert an X-header in the message to identify which spam test it failed. You can also create delivery rules to search for the spam X-Headers and process the message accordingly.

Accessing the Anti-spam Features

The Anti-spam options are accessed from two levels: the server level and domain level.

Related Topics

Anti-spam Configuration Overview