Common reasons for false positives

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What are the common reasons for false positives?

By default, all policies will be enforced at a domain level. This provides the maximum level of protection for a domain name. However, this level of protection may interfere with certain legitimate emails also.

The following table details some common causes of false positives and the associated policies which will require exception rules.

  • Newsletters

HTML is poorly written; too many images; off-site images; attempts to track receiving of email.

  • Automated emails from financial and payroll packages

Attachments can not be scanned; attachments have double extensions E.g. .rpt.pdf

  • Tickets and reservation confirmations

Off-site images; attempts to track receiving of email

  • Encrypted attachments

Can not be scanned for security risks

  • Drawings from architectural and graphics packages

attachments have double extensions E.g. .rpt.pdf

  • Content from on-line auction and trading sites

HTML is poorly written; HTML contains methods for relaying data back to an external site; attempts to track receiving of email

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