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What can Clearswift MIMEsweeper for SMTP

Central solution

Clearswift MIMEsweeper for SMTP is an essential gateways-content-security-solution to companies that need to enforce policies on their eMail traffic. MIMEsweeper made Clearswift a pioneer in the segment of content filtering and yet they still are market leader with this technology.

Content filtering stops the less obvious threats that are even more dangerous than spam and viruses. Like confidential customer data being mailed to a competitor, and illegal, immoral or just plain unpleasant material coming in or out. It prevents the leaking of information that could put businesses in breach of regulations such as SEC, NASD, Sarbanes-Oxley, HIPAA, Gramm-Leach-Bliley, Basel II, or the Data Protection Act.

Content Security

eMails and attachments are decomposed into their components and checked against policies before entering or leaving the company. Unwanted or dangerous eMails and attachments are detected, stopped and treated according to the applicable rules.

SpamLogic Anti-Spam

With the new multilevel anti-spam solution SpamLogic and the Personal Message Manager (PMM) spam can be fought efficiently without any administrative effort. Automatic and proactive spam- and threat-updates keep the system up-to-date.

This completely new anti-spam-solution has been developed in collaboration with John Graham-Cumming, a leading expert in fighting spam. SpamLogic is based on many separate countermeasures which sum up to a detection rate of 99 percent. This is the highest rate in this line of business.

Three layers filter the largest part of the spam. The fourth layer takes away the last change for getting through.

  1. Engine - It checks eMails by origin, content, recipient, attachments and executable files and applies the defined policies.
  2. Filter - It combines Bayesian-classifications, heuristic and text based analysis and learning effects from the Personal Message Manager.
  3. Feed - Profiles of thousands of daily spam eMails. Collected by our 20 million users and hundreds of additional spam harvesting eMail accounts.
  4. PMM (Personal Message Manager) - Allows the end user to manage their quarantine folder personally - including whitelists. Improves detection accuracy and corrects false positive. This saves the IT-department unnecessary administrative duties.

Management & Reporting

MIMEsweeper for SMTP on top of that has a comprehensive Remote-Management and -Reporting, which can be controlled via a role-based access model.

Virus protection

MIMEsweeper for SMTP has been designed to utilize a virus scanner of your choice. It even improved its efficiency by decomposing the eMail in its components before passing it to the scanner.

With MIMEsweeper your virus scanner can detect viruses in compressed attachments that are easily overlooked by more simple scanners in other content security products.

Common virus scanner can only detect known viruses. With MIMEsweeper for SMTP and "Zero-Day"-protection you stay save from new viruses even before the patterns are available.


Encryption and digital signatures offer protection for confidential messages. On the other hand new problems may arise, because not only the outside attacker, but also the security solution is not granted any access.

MIMEsweeper is designed in a way, to support CompanyCRYPT for gateway-signing, de- and encryption and a policy based management against problems that may arise from encrypted eMails.

Last change: 19.05.2023, Product of Interest: