Depuis quelques jours, j'ai ce type de message au bas de bcp de mes mails reçus :
 

 
Cékoidonc ce truc ?  

ton admin ou l'admin de tes corres a du mettre un soft de filtrage de mail  
enfin c'est juste une supposition
 
Privawall:
http://www.aliroo.com/
 
Policy-based e-mail security server
 
Automatically and Transparently conducts the following:  
 
   
 
+ Content Filtering of e-mail Subject, Text and Attachments.  
 
+ Certificate-based S/MIME Encryption/Decryption ability.  
 
+ Self-Decrypting Symmetric messages.  
 
+ Anti-virus scanning of the organization?s incoming and outgoing e-mail traffic.  
 
+ LDAP directory services.  
 
+ Automatic retrieval of certificates from incoming signed e-mails.  
 
+ Digital signing of Outgoing e-mails.  
 
+ Client mail-relay secures all e-mails from the client?s computer to the PrivaWall server.  
 
+ Automatic messages logging and archiving and an integrated simulation engine.