Working on the perimeter, the Mail Guard acts as an application layer proxy performing deep content inspection and applying configurable content policies to pass/block/quarantine or modify content in email.



Deep content inspection –

examines messages and attachments for the presence of known threats and the possibility of accidental data loss.

Granular policy rules –

block, pass or modify based on source, destination, user, group, content type, data type, label, phrase and the presence of signed and/or encrypted content

Market leading protection –

for protectively marked content, including support for S/MIME ESS, P772, X.411 and ASN.1 encoded labels

Integrity and secrecy –

checking address validation rules and enforcing policies on S/MIME signed and encrypted messages

Enforcing Checks

Mail Guard uses Deep Content Inspection to examine content for both inbound threats and outbound data loss. A market leader in enforcing checks on clearances and security labels in content, it is used by some of the most security-conscious organisations in the world.


Request a demo Contact us



X.400 Military Messaging 


Can apply policy rules to over 200 file formats including:

Office formats (Microsoft Office, PDF, etc.)

Image formats

Structured data (JSON, XML, etc.)



  • Cloud

  • Physical

  • Virtual


Mail Guard can be deployed on a Linux or Solaris server. For systems that face the most sophisticated attackers, the Mail Guard can be deployed on Deep-Secure’s Bastion platform, utilising Oracle’s Solaris 10 Trusted Extensions operating system to maintain physical network separation.


Optionally, it can also be deployed alongside an iX Appliance to add threat removal and provide strong physical network separation.


Request a demo Contact us