The present invention discloses a system for blocking unsolicited emails. The system comprising: a server application for providing a filtering service between at least one protected and a second mail subscribe. The server application is comprised of: a communication module for establishing secure connections between at least two mail subscribers, a repository of secure connections including records of secure mail addresses created for each secure connection, an interception module for verifying secure messages by comparing the sender's address to the sender address in the secure connection repository, a transmission module for forwarding the verified messages to the public target mail address by translating between secure mail address and the public mail addresses of verified messages.