Implementation of DKIM Verification System Using POP Proxy

Recent years, many attackers send many emails spoofed as those sent from a bank or a government etc., and are getting money by fraud. DKIM is one of the sender domain authentication method, it can be determined whether the sent email is delivered without alteration from a legitimate sender by verifying the electronic signature at the receiving time. However, DKIM verification mechanism is not prevalent especially in the receiving server. In this paper, we propose a system that verifies the DKIM signature by a POP proxy in place of a receiving server and notifies the result to each user.