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Multi-Agent Systems (MAS) are groups of autonomous agents that act in the same environment, competing or collaborating to achieve individual or collective goals. Some main challenges encountered in communicating different MAS are the connectionless protocols used by some IoT middlewares for agent communication and the lack of security in transferring messages over the internet. Therefore, it is essential to use efficient, safe, and reliable means of communication. This work proposes a connection-oriented communication architecture using secure channels provided by network protocols in the application layer, such as POP3, SMTP, and IMAP. Each has specific characteristics that may be suitable for different MAS communication scenarios. This work contributes to advancing external multi-agent systems communication by presenting a customized agent architecture based on the Jason framework to enable secure and simplified communication supported by e-mail.