• 82 out of 100 cyber attacks are carried out via email*

    NoSpamProxy Protection offers proactive, real-time protection against spam, ransomware, malware and spyware.

    Spam Filter NoSpamProxy Protection

Sender- & Recipient Reputation

Combination of nine different tests to optimize email security. The most important tests are SPF, DKIM and DMARC.

Smart Attachment- & URL-Management

Attachments are automatically converted into non-critical PDF files. The recipient receives a guaranteed safe attachment.

Zero-Hour™ Virus Protection

The Cyren Zero-Hour Technology is one of the best proactive anti-spam technology. It is based on the Recurrent Pattern Detection™ Technology (RPD™).

Anti-Spam / Anti-Ransomware

82 out of 100 cyber attacks are carried out via email*

NoSpamProxy® Protection scans every single email as soon as it hits the first SMTP gateway, ensuring complete protection against spam, ransomware, spyware and malware. NoSpamProxy classifies the email using a variety of anti-spam filters. Spam emails are rejected reliably. Only emails that are classified as neutral or trusted are allowed to pass the anti-spam gateway. In addition, should a trusted email not be accepted for some reason, NoSpamProxy Protection will inform the senders about the rejected email.


There is a wide choice of anti-spam solutions available on the market. What makes NoSpamProxy stand out?

NoSpamProxy is one of the few anti-spam solutions compliant with challenging German laws (particularly in accordance with §206 of the StGB [Criminal Code] and §88 of the Telecommunications Act). 

The legal consequences that may arise from just receiving and accepting emails at the company’s email gateway are avoided. In addition, damage claims based on emails stored in quarantine folders cannot affect NoSpamProxy users. A high level of productivity and maximum protection with minimal operating expenses also distinguish NoSpamProxy from other solutions. In most cases, these expenses will be amortized after just a few months, especially in Microsoft Server-based IT environments.

The quarantine problem of conventional anti-spam solutions

The problem common to all spam protection solutions is that the software decides whether an email is classified as spam. In many cases, not all spam emails are detected, or uncontaminated emails are accidently blocked (false positives). These false positives are a huge threat for companies and a weakness in many conventional anti-spam solutions. If such emails are deleted or stored in a quarantine folder, it is nearly impossible to locate them once they have been quarantined.

Maintain communication with Level of Trust

If NoSpamProxy Protection detects a message as spam, the Anti-Spam Gateway refuses to accept the spam mail. Unlike other spam solutions, the sender receives a message that the email was not delivered. The sender can then respond by calling the recipient and asking them to send him an email. This addresses the level of trust function, so that e-mails from this sender are accepted in future. Experience has shown that spammers are no longer interested in the recipient’s address due to the additional work involved. This has the additional advantage that the volume of spam sent to NoSpamProxy-protected domains decreases significantly after some time.

Keep track of spam

The powerful reporting capabilities of NoSpamProxy Protection allow you to keep a constant eye on your email traffic. The volume of data as well as emails and spam can be analysed in detail. The integrated message tracking function creates log files for every single email, including information on how the email has been processed. Also, information on rules and anti-spam filters applied as well as actions carried out are stored. The records and reports created by NoSpamProxy Protection allow administrators to constantly and easily monitor all notifications.

SwissLife Logo NoSpamProxy

The Level of Trust filter is excellent. It is reliable to stop known spammers and guarantees that mails from our business partners and customers are delivered. Jürgen Lalla, IT-Leiter Swiss Life Select

Implementing company-wide email policies with the rules editor. Centrally, simply, Active Directory-controlled.


Granular specification of rules allows for easy implementation of exceptions.


Assigning filters to rules allows for maximum flexibility.


Assigning actions to rules for increases flexibility.

Virus Bulletin confirms 0% false positive rate for NoSpamProxy

With a score of 99.99 out of 100, NoSpamProxy has earned the prestigious VB Spam + Gold rating for IT security.

“NoSpamProxy scored an excellent strike rate of 99.99% in the anti-spam test carried out by Virus Bulletin. In addition, it also impressed with its 0.00% false positive rate. Not only does NoSpamProxy perform brilliantly in terms of spam protection but it also offers cutting-edge protection from malware and ransomware, which we have started testing for in the latest version of our tests.” Martijn Grooten, Editor in Chief at the Virus Bulletin

Read the complete press release.

Only available with NoSpamProxy

NoSpamProxy Protection is continuously getting to know your communication habits; emails from these partners will not be rejected, even if certain properties indicate that these emails are spam or ransomware. This is made possible by NoSpamProxy’s Level of Trust capability, its Sender and Recipient Management System as well as its Smart Attachment Management, three features unique to NoSpamProxy.

Level of Trust

Keep communication alive with NoSpamProxy’s Dynamic Whitelist and Level of Trust

If a communication partner is mistakenly identified as a spammer, a single email sent suffices to instruct NoSpamProxy’s Level of Trust capability to allot trust points to the partner who will subsequently be accepted by NoSpamProxy. The time and effort required by IT administrators to manually update whitelists on Microsoft Windows server – a typical scenario when using conventional spam solutions – is no longer necessary.

Trusted communication with trusted partners  NoSpamProxy Protection scans outbound emails and assigns so-called trust points to the recipient of the email. Over time, these points are aggregated to build a database used to allow inbound emails to pass – provided a communication relationship exists. This also applies to cases in which other spam filters would classify this email as not trustworthy, for example because the sender is on a blacklist.

Message Tracking in NoSpamProxy

Sender Reputation Management

Sender reputation filter

To guarantee the highest possible degree of security, NoSpamProxy applies a combination of 27 different tests on all emails and email attachments. The tests for compliance with SPF, DKIM and DMARC protocols make it possible to verify the authenticity of the email sender and to react appropriately in case of an attack. The nine tests carried out by NoSpamProxy are then combined with the Level of Trust filters, a technology based on self-learning and dynamic white listing.

CxO Fraud Filter

NoSpamProxy also operates with CxO fraud detection. This involves comparing the sender name of incoming e-mails with the names of key users in your company. In this way, fake e-mails sent to you or your employees on behalf of superiors, employees or customers are intercepted.

Smart Attachment Management, Content Disarming

An important potential for combating malware is the handling of email attachments. For this purpose, NoSpamProxy contains a function that allows rule-based attachments in Word or Excel format and can be automatically converted into uncritical PDF files. Any potentially existing malicious code remains unaffected. The recipient is thus guaranteed to receive a non-committable attachment. The PDF document optionally contains a preview page with individual notes on the reason for the conversion and – if desired – also a link to the original document, which is in a special quarantine, which we map with the Large Files module.


NoSpamProxy uses the SURBL filters to scan e-mails for harmful URLs and blocks affected e-mails. In addition, the fine-tuned URL Safeguard allows URLs in incoming e-mails to be rewritten so that when the user clicks on the URL, it is checked again to see whether there are negative assessments for this URL. This increases security, as some attackers change the destination of URLs a few hours after sending. This makes them appear harmless on receipt, but are dangerous later. By using the unique level-of-trust concept of NoSpamProxy – the reputation is continuously determined for each sender – URL Safeguard can, for example, only be activated for unknown communication partners. In addition, Net at Work offers a cloud service with a curated and daily updated white list for trustworthy domains that are not rewritten across the board.

Real-Time Virus Protection

Anti-Spam and Anti-Malware with leading Zero-Hour Technology

Everyday, cybercriminals produce millions of spam emails to spread malware and ransomware. Malware software, in turn, is used to misuse infected PCs for generation of endless amounts of spam emails. To fend off these combined threats, NoSpamProxy Protection with Zero-Hour ™ Outbreak Protection Technology offers real-time protection against viruses.

Instant protection against threats such as Emotet, WannaCry, Locky and more

Cyren Zero-Hour Technology is the ultimate proactive anti-spam technology, offering instant protection against viruses, ransomware, malware and spyware. It is based on Rapid Pattern Detection™ (RPD™) technology which already protects more than 600 million users worldwide. This is made possible by patented Cyren technology which examines a large amount of the global Internet traffic in real time and analyses more than two billion messages per day. Spreading patterns and structures of viruses, malware and phishing activities are identified instantly and used by NoSpamProxy Protection as part of its anti-spyware and anti-malware components as well for fending off phishing attempts and spyware.

Sandboxing as a further level of protection

For increased e-mail security, NoSpamProxy offers a paid add-on module with sandboxing. The sandbox is mainly used to defend against zero-day attacks, targeted attacks and Advanced Persistent Threats (APTs). Since professional hackers with different strategies can detect traditional sandboxing environments, NoSpamProxy uses a special sandbox array technology. This is characterized by multiple sandboxes and is able to reliably detect malicious behavior of files and URLs and quickly distribute this knowledge by means of comprehensive swarm intelligence.

Immediate use of newly discovered virus signatures

NoSpamProxy Protection integrates Cyren Zero-Hour Technology and proactively scans the Internet to identify potential virus outbreaks in real time. Unlike signature-based approaches, NoSpamProxy recognizes new virus outbreaks as soon as they occur and protects your Exchange server and email infrastructure within the first hour of the attack.

Over 4.000 businesses trust NoSpamProxy to protect their email communication. Here are a few of them:


How can we help you?

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