Chapter 21. exim4: Setting Up Mail Servers, Clients, and More

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Sending and receiving email require three pieces of software. At each end, there is a client, called an MUA (mail user agent), which is a bridge between a user and the mail system. Common MUAs are mutt, Evolution, KMail, Thunderbird, and Outlook. When you send an email, the MUA hands it to an MTA (a mail transfer agent, such as exim4 or sendmail), which transfers it to the destination ...

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