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==EXPLORATION QUESTIONS==
#What is the purpose of an MTA?# What is the purpose of an MUA?# Draw a simple diagram showing how an MUA and an MTA are used to send e-mail messages between different servers.# List the steps to test a running postfix service using the telnet application.# What is the purpose of the Thunderbird application?# List the steps to configure your DNS to temporarily allow your Thunderbird application to connect to your mail server.