Patent ID: 8255683
Filing Date: 2012-08-28
Classification: H04L

Abstract:
1. A computer-implemented method for filtering e-mail messages transmitted from an external site to an internal site associated with a first policy, comprising: i. intercepting using an SMTP relay implemented as programmed computer hardware an e-mail message having a sender address associated with an external site; ii. detecting whether said e-mail message includes a digital signature; iii. applying at least one policy condition to said e-mail message, said policy condition applied by reference to the digital signature, said applying providing a policy application result; iv. applying at least a second policy condition to said e-mail message in response to a predetermined condition of the digital signature, the second policy condition selected by reference to an identity associated with the digital signature; v. detecting that the digital signature is a valid digital signature; and vi. processing said e-mail message in accordance with said applying of the second policy.