Abstract: A process and communication equipment is provided for secured e-mail using security associations between mail domains of the Internet. E-mail passes though at least one device having a list of security associations. The sending domain equipment verifies the name of the destination domain of each e-mail received from its mail server based on a list of existing security associations. If there is no security association, the e-mail receives an identifier and is transferred to the receiver. If there is no identical communication equipment at the receiver, the e-mail is transferred in transparent state. If there is identical communication equipment at the receiver side, the e-mail is verified by the receiving equipment for an identifier and transferred to the receiver. If there is an entry in the security association list, the e-mail is transmitted in a secured state using the security parameters of the destination domain.