Pros / The app's false positive rate is near zero.

Cons / A yearly subscription fee is required.

 Verdict / The spam filter software has admirable capabilities and effectively prevents spam.

Editor’s Note: The developer notified the public that it is discontinuing DesktopOne Pro on December 1, 2017. This product is no longer updated or supported by Cloudmark. You can find additional information here. You can also read our current review of this product below or compare other software in our review of the best Spam Filters.

Cloudmark DesktopOne Pro receives our Top Ten Reviews Silver Award in our review of spam filter software. The spam blocker has many of the same features and functionalities as our third place product, MailWasher Pro 2010. However, Cloudmark DesktopOne Pro's small system load, nearly perfect accuracy rate and ease of use are slightly superior to the equivalent features of MailWasher Pro 2010.

Cloudmark DesktopOne Pro uses a different technique to mitigate spam than the spam filter software MailWasher Pro 2010. Cloudmark DesktopOne Pro actually downloads all incoming messages to the email client's inbox and automatically moves incoming email suspected of being spam to a designated spam folder.

Alternately, the spam filter software MailWasher Pro 2010 leaves all incoming messages on the POP3 mail-server. While still on the server, the spam blocker identifies and recommends suspected spam email for deletion. Both of these approaches are successful and have their advantages. Ultimately, it is up to the user to decide which spam filter software methodology is best suited to their personal needs.

Clearly, Cloudmark DesktopOne has some admirable features and capabilities as a spam blocker solution.

Our spam filter software Review contains side-by-side objective comparisons of these three and other highly rated spam blocker applications. Please continue reading below for a full discussion of the spam filter software Cloudmark DesktopOne Pro's full capabilities and features.

Cloudmark Inc. maintains its headquarters in San Francisco, Calif. and has several offices around the world. The company develops messaging security solutions that protect users from spam, phishing, viruses and other malware applications. The spam filter software Cloudmark DesktopOne Pro is one of the company's main products.

The installation of the spam filter software is straightforward, efficient and fast. On first launch, the spam blocker looks for existing installations of supported email clients. Once found, the spam filter software integrates with the email client by installing an easy-to-navigate toolbar. The spam blocker has a toolbar plug-in available for Microsoft Outlook, Microsoft Outlook Express, Mozilla Thunderbird and Microsoft Mail.

The spam filter software was easy to remove via the Microsoft Windows Control Panel. On reboot, no remnant of the spam blocker could be loaded into the computer's operating system.

Cloudmark DesktopOne Pro 1 Visit Site


The spam filter software Cloudmark DesktopOne Pro implements a community-based approach to block and filter both spam and bulk email messages. Over a million users drive the spam blocker’s online database. The efforts of these users combine to identify and thwart the senders of spam email. Further, the number of emails that are falsely marked as spam is near zero.

When a member of the online community marks an email as spam, the spam filter software automatically transmits a fingerprint of the message's attributes to the online database. After multiple users have marked the same fingerprint as spam, the spam filter software blocks the unwanted email for all other users within the community.

On occasion, some users still receive a minimal amount of spam email. The expectation is that they will mark the unwanted message as spam so the spam filter software can report the incident back to the community-based online database. To do so, the user must click the spam filter software's Block Spam button.

The spam filter software automatically moves all received spam email from the user's inbox to a designated spam folder. Once there, users can review the marked message and sort them to see if the folder contains wanted communications such as subscription-based newsletters, announcements and other legitimate messages.


The spam filter software can support multiple email accounts with a single installation. Cloudmark DesktopOne Pro's Always-on Email Filtering component constantly filters messages. Because of this feature, the spam filter software successfully blocks phishing attacks, email-borne viruses, keyloggers and other malware threats.

The spam blocker's protection continues even when the user's email client is closed. This shielding component can extend to Webmail even if the service is not open in the user's browser.


The spam blocker Cloudmark DesktopOne Pro has numerous customizable features. The spam filter software's On-demand scanning component gives the user the ability to choose how often a folder is scanned for spam email messages.

With the Smartlist feature, users of the spam blocker can add their existing email contacts to the spam filtering software's Smartlist with a simple click. Doing so ensures that family members, friends, work contacts and other correspondences are never marked as spam email. Moreover, users can select their own protection level and message delivery options. Other options include the ability to block and unblock any email message.


Refreshingly, the spam filter software Cloudmark DesktopOne Pro supports all POP3 and IMAP email accounts. The spam blocker integrates easily with Microsoft Outlook, Microsoft Outlook Express, Thunderbird and Windows Mail.

Additionally, Cloudmark DesktopOne Pro can filter Webmail and HTTP-based email. The spam filter software can achieve this task because it works independently of the email client. Despite this ability, the spam filter software cannot integrate with the web-interface for these email services. Supported but non-integrated email services include MSN, Gmail, AOL, Yahoo and others.


Cloudmark DesktopOne Pro is an effective, robust and refreshingly accurate spam blocker tool. With the community-based approach to blocking and filtering, users rarely receive unwanted spam and bulk email messages.

Cloudmark DesktopOne Pro 1 Visit Site

Specifications and Benchmarks

Operating System

Microsoft Windows 8
Microsoft Windows 7
Microsoft Windows Vista
Microsoft Windows XP


Block/Allow by IP Address
Block/Allow by Server
Block/Allow by Email Address
Black/White List
Automatic Deletion
Automatic Filtering
Quarantine Area
Sensitivity Settings
Public Black List
Community-based Filtering
Image Blocking
Country Code Filtering
Bayesian Filter
Permission-based Filtering

Special Offers

Discount Coupons


Custom Rules
Multiple Rule Selection
Pre-defined Rules


Identity Theft

Customer Support

Contact Form/Email
Telephone Support
Support Ticket System
Support Forum


Windows Mail
Outlook Express