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Domain keys identified mail (DKIM) defines a mechanism for using digital signatures on E-Mail at the domain level, allowing the receiving domain to confirm that E-Mail came from the domain it claims to. Erasure codes introduce pollution attack, an attack in which the adversary injects packets to disrupt the erasure decoding procedure and consequently denies the authentication service to the receiver. This paper uses the agent for checking the spam E-Mail by using DKIM and proposes a new lightweight, pollution-attack resistant multicast authentication scheme (PARM), which generates evidence that receiver agent can validate on a fast, per-packet basis. Using agent, the authenticity of the system will increase and also our system will be more secure. Because of using the temporal key, time will be saved for generating evidence to the same message.